diff --git a/custom_components/ble_monitor/ble_parser/__init__.py b/custom_components/ble_monitor/ble_parser/__init__.py
index b82855f8..a4c7f41e 100644
--- a/custom_components/ble_monitor/ble_parser/__init__.py
+++ b/custom_components/ble_monitor/ble_parser/__init__.py
@@ -202,6 +202,10 @@ def parse_advertisement(
                     uuid16 = (service_data[3] << 8) | service_data[2]
                     if uuid16 == 0x1809:
                         # UUID16 = Health Thermometer service (used by Relsib)
+                        if len(service_data_list) == 3:
+                            uuid16_2 = (service_data_list[1][3] << 8) | service_data_list[1][2]
+                            if uuid16_2 == 0x181A:
+                                service_data = b"".join(service_data_list)
                         sensor_data = parse_relsib(self, service_data, mac)
                         break
                     if uuid16 == 0x181A:
diff --git a/custom_components/ble_monitor/ble_parser/acconeer.py b/custom_components/ble_monitor/ble_parser/acconeer.py
index 0dc522c5..0c3dd7ae 100644
--- a/custom_components/ble_monitor/ble_parser/acconeer.py
+++ b/custom_components/ble_monitor/ble_parser/acconeer.py
@@ -13,7 +13,7 @@
 }
 
 
-def parse_acconeer(self, data: bytes, mac: str):
+def parse_acconeer(self, data: bytes, mac: bytes):
     """Acconeer parser"""
     msg_length = len(data)
     firmware = "Acconeer"
diff --git a/custom_components/ble_monitor/ble_parser/airmentor.py b/custom_components/ble_monitor/ble_parser/airmentor.py
index 2db1905e..2a7d8d30 100644
--- a/custom_components/ble_monitor/ble_parser/airmentor.py
+++ b/custom_components/ble_monitor/ble_parser/airmentor.py
@@ -104,7 +104,7 @@ def parse_2s(msg_type, xvalue):
         return None
 
 
-def parse_airmentor(self, data: bytes, mac: str):
+def parse_airmentor(self, data: bytes, mac: bytes):
     """Parser for Air Mentor"""
     data_length = len(data)
 
diff --git a/custom_components/ble_monitor/ble_parser/almendo.py b/custom_components/ble_monitor/ble_parser/almendo.py
index 099afb42..ffa79c35 100644
--- a/custom_components/ble_monitor/ble_parser/almendo.py
+++ b/custom_components/ble_monitor/ble_parser/almendo.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_almendo(self, data: bytes, mac: str):
+def parse_almendo(self, data: bytes, mac: bytes):
     """Almendo parser"""
     result = {
         "mac": to_unformatted_mac(mac),
diff --git a/custom_components/ble_monitor/ble_parser/altbeacon.py b/custom_components/ble_monitor/ble_parser/altbeacon.py
index 96b9b102..a48faee7 100644
--- a/custom_components/ble_monitor/ble_parser/altbeacon.py
+++ b/custom_components/ble_monitor/ble_parser/altbeacon.py
@@ -14,7 +14,7 @@
 DEVICE_TYPE: Final = "AltBeacon"
 
 
-def parse_altbeacon(self, data: str, comp_id: int, mac: str):
+def parse_altbeacon(self, data: bytes, comp_id: int, mac: bytes):
     """parser for Alt Beacon"""
     if len(data) >= 27:
         uuid = data[6:22]
diff --git a/custom_components/ble_monitor/ble_parser/amazfit.py b/custom_components/ble_monitor/ble_parser/amazfit.py
index 4b9f59d2..2bdd586d 100644
--- a/custom_components/ble_monitor/ble_parser/amazfit.py
+++ b/custom_components/ble_monitor/ble_parser/amazfit.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_amazfit(self, service_data: str, man_spec_data: str, mac: str):
+def parse_amazfit(self, service_data: str | None, man_spec_data: str, mac: bytes):
     """parser for Amazfit scale and Miband 4 and 5"""
     if service_data:
         service_data_length = len(service_data)
diff --git a/custom_components/ble_monitor/ble_parser/atc.py b/custom_components/ble_monitor/ble_parser/atc.py
index 7332c77c..2c951e0d 100644
--- a/custom_components/ble_monitor/ble_parser/atc.py
+++ b/custom_components/ble_monitor/ble_parser/atc.py
@@ -9,7 +9,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_atc(self, data: bytes, mac: str):
+def parse_atc(self, data: bytes, mac: bytes):
     """Parse ATC BLE advertisements"""
     device_type = "ATC"
     msg_length = len(data)
diff --git a/custom_components/ble_monitor/ble_parser/bluemaestro.py b/custom_components/ble_monitor/ble_parser/bluemaestro.py
index 1f2a1fe6..cf3ab85c 100644
--- a/custom_components/ble_monitor/ble_parser/bluemaestro.py
+++ b/custom_components/ble_monitor/ble_parser/bluemaestro.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_bluemaestro(self, data: bytes, mac: str):
+def parse_bluemaestro(self, data: bytes, mac: bytes):
     """Parse BlueMaestro advertisement."""
     msg_length = len(data)
     firmware = "BlueMaestro"
diff --git a/custom_components/ble_monitor/ble_parser/blustream.py b/custom_components/ble_monitor/ble_parser/blustream.py
index 97abd87f..44b40d91 100644
--- a/custom_components/ble_monitor/ble_parser/blustream.py
+++ b/custom_components/ble_monitor/ble_parser/blustream.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_blustream(self, data: bytes, mac: str):
+def parse_blustream(self, data: bytes, mac: bytes):
     """Parse Blustream advertisement."""
     msg_length = len(data)
     firmware = "Blustream"
diff --git a/custom_components/ble_monitor/ble_parser/bparasite.py b/custom_components/ble_monitor/ble_parser/bparasite.py
index 030673b5..a35b809d 100644
--- a/custom_components/ble_monitor/ble_parser/bparasite.py
+++ b/custom_components/ble_monitor/ble_parser/bparasite.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_bparasite(self, data: bytes, mac: str):
+def parse_bparasite(self, data: bytes, mac: bytes):
     """Check for adstruc length"""
     msg_length = len(data)
     if msg_length == 22:  # TODO: Use protocol bits?
diff --git a/custom_components/ble_monitor/ble_parser/helpers.py b/custom_components/ble_monitor/ble_parser/helpers.py
index 10d43985..6fe08193 100644
--- a/custom_components/ble_monitor/ble_parser/helpers.py
+++ b/custom_components/ble_monitor/ble_parser/helpers.py
@@ -2,16 +2,16 @@
 from uuid import UUID
 
 
-def to_uuid(uuid: str) -> str:
+def to_uuid(uuid: bytes) -> str:
     """Return formatted UUID"""
     return str(UUID(''.join(f'{i:02X}' for i in uuid)))
 
 
-def to_mac(addr: str) -> str:
+def to_mac(addr: bytes) -> str:
     """Return formatted MAC address"""
     return ':'.join(f'{i:02X}' for i in addr)
 
 
-def to_unformatted_mac(addr: str) -> str:
+def to_unformatted_mac(addr: bytes) -> str:
     """Return unformatted MAC address"""
     return ''.join(f'{i:02X}' for i in addr[:])
diff --git a/custom_components/ble_monitor/ble_parser/ibeacon.py b/custom_components/ble_monitor/ble_parser/ibeacon.py
index 994f72d2..a174f45b 100644
--- a/custom_components/ble_monitor/ble_parser/ibeacon.py
+++ b/custom_components/ble_monitor/ble_parser/ibeacon.py
@@ -14,7 +14,7 @@
 DEVICE_TYPE: Final = "iBeacon"
 
 
-def parse_ibeacon(self, data: str, mac: str):
+def parse_ibeacon(self, data: bytes, mac: bytes):
     """Parse iBeacon advertisements"""
     if data[5] == 0x15 and len(data) >= 27:
         uuid = data[6:22]
diff --git a/custom_components/ble_monitor/ble_parser/inkbird.py b/custom_components/ble_monitor/ble_parser/inkbird.py
index f7ed6af9..8e7e27ce 100644
--- a/custom_components/ble_monitor/ble_parser/inkbird.py
+++ b/custom_components/ble_monitor/ble_parser/inkbird.py
@@ -16,7 +16,7 @@ def convert_temperature(temp):
     return temperature
 
 
-def parse_inkbird(self, data: bytes, complete_local_name: str, mac: str):
+def parse_inkbird(self, data: bytes, complete_local_name: str, mac: bytes):
     """Inkbird parser"""
     msg_length = len(data)
     firmware = "Inkbird"
diff --git a/custom_components/ble_monitor/ble_parser/inode.py b/custom_components/ble_monitor/ble_parser/inode.py
index 54453163..6cf4ecbf 100644
--- a/custom_components/ble_monitor/ble_parser/inode.py
+++ b/custom_components/ble_monitor/ble_parser/inode.py
@@ -41,7 +41,7 @@ def adj_acc(acc):
     return acc
 
 
-def parse_inode(self, data: bytes, mac: str):
+def parse_inode(self, data: bytes, mac: bytes):
     """iNode parser"""
     msg_length = len(data)
     firmware = "iNode"
diff --git a/custom_components/ble_monitor/ble_parser/jaalee.py b/custom_components/ble_monitor/ble_parser/jaalee.py
index d1b3b688..977b6de6 100644
--- a/custom_components/ble_monitor/ble_parser/jaalee.py
+++ b/custom_components/ble_monitor/ble_parser/jaalee.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_jaalee(self, data: bytes, mac: str):
+def parse_jaalee(self, data: bytes, mac: bytes):
     """Jaalee parser"""
     msg_length = len(data)
     firmware = "Jaalee"
diff --git a/custom_components/ble_monitor/ble_parser/jinou.py b/custom_components/ble_monitor/ble_parser/jinou.py
index 9a7e7ac6..f8216d16 100644
--- a/custom_components/ble_monitor/ble_parser/jinou.py
+++ b/custom_components/ble_monitor/ble_parser/jinou.py
@@ -6,7 +6,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_jinou(self, data: bytes, mac: str):
+def parse_jinou(self, data: bytes, mac: bytes):
     """Jinou parser"""
     msg_length = len(data)
     firmware = "Jinou"
diff --git a/custom_components/ble_monitor/ble_parser/kegtron.py b/custom_components/ble_monitor/ble_parser/kegtron.py
index 3429457f..09f3b0a3 100644
--- a/custom_components/ble_monitor/ble_parser/kegtron.py
+++ b/custom_components/ble_monitor/ble_parser/kegtron.py
@@ -21,7 +21,7 @@
 }
 
 
-def parse_kegtron(self, data: bytes, mac: str):
+def parse_kegtron(self, data: bytes, mac: bytes):
     """Parser for Kegtron sensors"""
     msg_length = len(data)
     if msg_length == 31:
diff --git a/custom_components/ble_monitor/ble_parser/kkm.py b/custom_components/ble_monitor/ble_parser/kkm.py
index b39ad0bb..49f6b964 100644
--- a/custom_components/ble_monitor/ble_parser/kkm.py
+++ b/custom_components/ble_monitor/ble_parser/kkm.py
@@ -8,7 +8,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_kkm(self, data: bytes, mac: str):
+def parse_kkm(self, data: bytes, mac: bytes):
     """Parser for KKM sensors."""
     device_type = "K6 Sensor Beacon"
     result = {
diff --git a/custom_components/ble_monitor/ble_parser/laica.py b/custom_components/ble_monitor/ble_parser/laica.py
index 7f914f6c..c1c9b790 100755
--- a/custom_components/ble_monitor/ble_parser/laica.py
+++ b/custom_components/ble_monitor/ble_parser/laica.py
@@ -30,7 +30,7 @@ def read_impedance(data):
     return impedance
 
 
-def parse_laica(self, data: bytes, mac: str):
+def parse_laica(self, data: bytes, mac: bytes):
     """Parser for Laica sensors"""
     xvalue = data[4:]
 
diff --git a/custom_components/ble_monitor/ble_parser/mikrotik.py b/custom_components/ble_monitor/ble_parser/mikrotik.py
index ebdc6ee3..0a40ad73 100644
--- a/custom_components/ble_monitor/ble_parser/mikrotik.py
+++ b/custom_components/ble_monitor/ble_parser/mikrotik.py
@@ -13,7 +13,7 @@ def convert_8_8_to_float(val_1, val_2):
     return val_1 + (val_2 / 256)
 
 
-def parse_mikrotik(self, data: bytes, mac: str):
+def parse_mikrotik(self, data: bytes, mac: bytes):
     """Inkbird parser"""
     msg_length = len(data)
     firmware = "Mikrotik"
diff --git a/custom_components/ble_monitor/ble_parser/miscale.py b/custom_components/ble_monitor/ble_parser/miscale.py
index 1946b1c4..8c20e9b2 100644
--- a/custom_components/ble_monitor/ble_parser/miscale.py
+++ b/custom_components/ble_monitor/ble_parser/miscale.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_miscale(self, data: bytes, mac: str):
+def parse_miscale(self, data: bytes, mac: bytes):
     """Parser for Xiaomi Mi Scales."""
     msg_length = len(data)
     uuid16 = (data[3] << 8) | data[2]
diff --git a/custom_components/ble_monitor/ble_parser/moat.py b/custom_components/ble_monitor/ble_parser/moat.py
index 4822c860..af039b36 100644
--- a/custom_components/ble_monitor/ble_parser/moat.py
+++ b/custom_components/ble_monitor/ble_parser/moat.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_moat(self, data: bytes, mac: str):
+def parse_moat(self, data: bytes, mac: bytes):
     """Parser for Moat sensors"""
     msg_length = len(data)
     firmware = "Moat"
diff --git a/custom_components/ble_monitor/ble_parser/oral_b.py b/custom_components/ble_monitor/ble_parser/oral_b.py
index e203cf34..ede71761 100644
--- a/custom_components/ble_monitor/ble_parser/oral_b.py
+++ b/custom_components/ble_monitor/ble_parser/oral_b.py
@@ -28,7 +28,7 @@
 }
 
 
-def parse_oral_b(self, data: bytes, mac: str):
+def parse_oral_b(self, data: bytes, mac: bytes):
     """Parser for Oral-B toothbrush."""
     msg_length = len(data)
     firmware = "Oral-B"
diff --git a/custom_components/ble_monitor/ble_parser/oras.py b/custom_components/ble_monitor/ble_parser/oras.py
index 0cbaf590..41fade7f 100644
--- a/custom_components/ble_monitor/ble_parser/oras.py
+++ b/custom_components/ble_monitor/ble_parser/oras.py
@@ -23,7 +23,7 @@
 }
 
 
-def parse_oras(self, data: bytes, mac: str):
+def parse_oras(self, data: bytes, mac: bytes):
     """Parser for Oras toothbrush or Garnet tank."""
     msg_length = len(data)
     result = {"mac": to_unformatted_mac(mac)}
diff --git a/custom_components/ble_monitor/ble_parser/qingping.py b/custom_components/ble_monitor/ble_parser/qingping.py
index b40816b6..52bd6637 100644
--- a/custom_components/ble_monitor/ble_parser/qingping.py
+++ b/custom_components/ble_monitor/ble_parser/qingping.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_qingping(self, data: bytes, mac: str):
+def parse_qingping(self, data: bytes, mac: bytes):
     """Qingping parser"""
     msg_length = len(data)
     if msg_length > 12:
diff --git a/custom_components/ble_monitor/ble_parser/relsib.py b/custom_components/ble_monitor/ble_parser/relsib.py
index ad14845c..faa60b24 100644
--- a/custom_components/ble_monitor/ble_parser/relsib.py
+++ b/custom_components/ble_monitor/ble_parser/relsib.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_relsib(self, data: bytes, mac: str):
+def parse_relsib(self, data: bytes, mac: bytes):
     """Relsib parser"""
     msg_length = len(data)
     uuid16 = (data[3] << 8) | data[2]
@@ -43,6 +43,14 @@ def parse_relsib(self, data: bytes, mac: str):
                 result.update({"battery": 100})
             else:
                 result.update({"battery": battery & 0b01111111})
+    elif uuid16 in [0x1809] and msg_length == 20:
+        device_type = "WH52"
+        try:
+            temp = round((int.from_bytes(data[4:6], byteorder='big') / 65535) * 175 - 45, 2)
+            humi = round((int.from_bytes(data[10:12], byteorder='big') / 65535) * 175 - 45, 2)
+            result.update({"temperature": temp, "humidity": humi})
+        except ValueError:
+            device_type = None
     elif uuid16 in [0x1809] and msg_length == 10:
         device_type = "WT51"
         try:
diff --git a/custom_components/ble_monitor/ble_parser/ruuvitag.py b/custom_components/ble_monitor/ble_parser/ruuvitag.py
index 07e3f8a2..443eab15 100644
--- a/custom_components/ble_monitor/ble_parser/ruuvitag.py
+++ b/custom_components/ble_monitor/ble_parser/ruuvitag.py
@@ -9,7 +9,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_ruuvitag(self, data: bytes, mac: str):
+def parse_ruuvitag(self, data: bytes, mac: bytes):
     """Ruuvitag parser"""
     device_type = "Ruuvitag"
     result = {
diff --git a/custom_components/ble_monitor/ble_parser/sensirion.py b/custom_components/ble_monitor/ble_parser/sensirion.py
index c72a0bfe..da1a5f74 100644
--- a/custom_components/ble_monitor/ble_parser/sensirion.py
+++ b/custom_components/ble_monitor/ble_parser/sensirion.py
@@ -13,7 +13,7 @@
 ]
 
 
-def parse_sensirion(self, data: bytes, complete_local_name: str, mac: str):
+def parse_sensirion(self, data: bytes, complete_local_name: str, mac: bytes):
     """Sensirion parser"""
     result = {"firmware": "Sensirion"}
     device_type = complete_local_name
diff --git a/custom_components/ble_monitor/ble_parser/sensorpush.py b/custom_components/ble_monitor/ble_parser/sensorpush.py
index 4a0a87f1..5d3476d7 100644
--- a/custom_components/ble_monitor/ble_parser/sensorpush.py
+++ b/custom_components/ble_monitor/ble_parser/sensorpush.py
@@ -67,7 +67,7 @@ def decode_values(mfg_data: bytes, device_type_id: int) -> dict:
     return values
 
 
-def parse_sensorpush(self, data: bytes, mac: str):
+def parse_sensorpush(self, data: bytes, mac: bytes):
     """Sensorpush parser"""
     result = {"firmware": "SensorPush"}
     device_type = None
diff --git a/custom_components/ble_monitor/ble_parser/senssun.py b/custom_components/ble_monitor/ble_parser/senssun.py
index 5d18e339..145828b2 100644
--- a/custom_components/ble_monitor/ble_parser/senssun.py
+++ b/custom_components/ble_monitor/ble_parser/senssun.py
@@ -12,7 +12,7 @@ def read_stable(ctr1):
     """Parse Stable"""
     return int((ctr1 & 0xA0) == 0xA0)
 
-def parse_senssun(self, data: bytes, mac: str):
+def parse_senssun(self, data: bytes, mac: bytes):
     """Parser for Senssun Scales."""
     xvalue = data[13:19]
 
diff --git a/custom_components/ble_monitor/ble_parser/smartdry.py b/custom_components/ble_monitor/ble_parser/smartdry.py
index 290fcb10..78d09f93 100644
--- a/custom_components/ble_monitor/ble_parser/smartdry.py
+++ b/custom_components/ble_monitor/ble_parser/smartdry.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_smartdry(self, data: bytes, mac: str):
+def parse_smartdry(self, data: bytes, mac: bytes):
     """Parser for SmartDry cloth dryer"""
     msg_length = len(data)
     if msg_length == 16:
diff --git a/custom_components/ble_monitor/ble_parser/switchbot.py b/custom_components/ble_monitor/ble_parser/switchbot.py
index 7cc90ee1..c841adb5 100644
--- a/custom_components/ble_monitor/ble_parser/switchbot.py
+++ b/custom_components/ble_monitor/ble_parser/switchbot.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_switchbot(self, data: bytes, mac: str):
+def parse_switchbot(self, data: bytes, mac: bytes):
     """Switchbot parser"""
     msg_length = len(data)
     device_id = data[4]
diff --git a/custom_components/ble_monitor/ble_parser/teltonika.py b/custom_components/ble_monitor/ble_parser/teltonika.py
index 948e69da..45cf2973 100644
--- a/custom_components/ble_monitor/ble_parser/teltonika.py
+++ b/custom_components/ble_monitor/ble_parser/teltonika.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_teltonika(self, data: bytes, complete_local_name: str, mac: str):
+def parse_teltonika(self, data: bytes, complete_local_name: str, mac: bytes):
     """Teltonika parser"""
     result = {"firmware": "Teltonika"}
     device_id = (data[3] << 8) | data[2]
diff --git a/custom_components/ble_monitor/ble_parser/thermobeacon.py b/custom_components/ble_monitor/ble_parser/thermobeacon.py
index 286847f1..b21fe75c 100644
--- a/custom_components/ble_monitor/ble_parser/thermobeacon.py
+++ b/custom_components/ble_monitor/ble_parser/thermobeacon.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_thermobeacon(self, data: bytes, mac: str):
+def parse_thermobeacon(self, data: bytes, mac: bytes):
     """Thermobeacon parser"""
     msg_length = len(data)
     device_id = data[2]
diff --git a/custom_components/ble_monitor/ble_parser/thermopro.py b/custom_components/ble_monitor/ble_parser/thermopro.py
index 97c58507..358da258 100644
--- a/custom_components/ble_monitor/ble_parser/thermopro.py
+++ b/custom_components/ble_monitor/ble_parser/thermopro.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_thermopro(self, data: bytes, device_type, mac: str):
+def parse_thermopro(self, data: bytes, device_type, mac: bytes):
     """Thermopro parser"""
     if device_type in ["TP357", "TP359"]:
         firmware = "Thermopro"
diff --git a/custom_components/ble_monitor/ble_parser/tilt.py b/custom_components/ble_monitor/ble_parser/tilt.py
index 460d42eb..32f1622b 100644
--- a/custom_components/ble_monitor/ble_parser/tilt.py
+++ b/custom_components/ble_monitor/ble_parser/tilt.py
@@ -11,7 +11,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_tilt(self, data: bytes, mac: str, ):
+def parse_tilt(self, data: bytes, mac: bytes):
     """Tilt parser"""
     if data[5] == 0x15 and len(data) == 27:
         uuid = data[6:22]
diff --git a/custom_components/ble_monitor/ble_parser/xiaogui.py b/custom_components/ble_monitor/ble_parser/xiaogui.py
index 7333c2bb..e837b60d 100644
--- a/custom_components/ble_monitor/ble_parser/xiaogui.py
+++ b/custom_components/ble_monitor/ble_parser/xiaogui.py
@@ -7,7 +7,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-def parse_xiaogui(self, data: bytes, mac: str):
+def parse_xiaogui(self, data: bytes, mac: bytes):
     """Xiaogui Scales parser"""
     msg_length = len(data)
 
diff --git a/custom_components/ble_monitor/ble_parser/xiaomi.py b/custom_components/ble_monitor/ble_parser/xiaomi.py
index f8819fac..277cb400 100755
--- a/custom_components/ble_monitor/ble_parser/xiaomi.py
+++ b/custom_components/ble_monitor/ble_parser/xiaomi.py
@@ -1293,7 +1293,7 @@ def obj5a16(xobj):
 }
 
 
-def parse_xiaomi(self, data: bytes, mac: str):
+def parse_xiaomi(self, data: bytes, mac: bytes):
     """Parser for Xiaomi sensors"""
     # check for adstruc length
     i = 9  # till Frame Counter
diff --git a/custom_components/ble_monitor/const.py b/custom_components/ble_monitor/const.py
index 74e99d3f..c8ffb25b 100755
--- a/custom_components/ble_monitor/const.py
+++ b/custom_components/ble_monitor/const.py
@@ -2165,6 +2165,7 @@ class BLEMonitorBinarySensorEntityDescription(
     'CGP23W'                  : 'Qingping',
     'EClerk Eco'              : 'Relsib',
     'WT51'                    : 'Relsib',
+    'WH52'                    : 'Relsib',
     'Blue Puck T'             : 'Teltonika',
     'Blue Coin T'             : 'Teltonika',
     'Blue Puck RHT'           : 'Teltonika',
diff --git a/custom_components/ble_monitor/manifest.json b/custom_components/ble_monitor/manifest.json
index cfaa88a9..7ec4932d 100644
--- a/custom_components/ble_monitor/manifest.json
+++ b/custom_components/ble_monitor/manifest.json
@@ -14,5 +14,5 @@
     "btsocket>=0.2.0",
     "pyric>=0.1.6.3"
   ],
-  "version": "12.17.0"
+  "version": "12.18.0"
 }
diff --git a/custom_components/ble_monitor/test/test_relsib.py b/custom_components/ble_monitor/test/test_relsib.py
index 11e99408..289b0657 100644
--- a/custom_components/ble_monitor/test/test_relsib.py
+++ b/custom_components/ble_monitor/test/test_relsib.py
@@ -105,3 +105,20 @@ def test_relsib_WT51(self):
         assert sensor_msg["data"]
         assert sensor_msg["temperature"] == 23.5
         assert sensor_msg["rssi"] == -62
+
+    def test_relsib_WH52(self):
+        """Test Relsib parser for Relsib WH52."""
+        data_string = "043e200201030130ddf27cb6fa14051609184dea05161a18b14c0716a2aa30333531c2"
+        data = bytes(bytearray.fromhex(data_string))
+        # pylint: disable=unused-variable
+        ble_parser = BleParser()
+        sensor_msg, tracker_msg = ble_parser.parse_raw_data(data)
+
+        assert sensor_msg["firmware"] == "Relsib"
+        assert sensor_msg["type"] == "WH52"
+        assert sensor_msg["mac"] == "FAB67CF2DD30"
+        assert sensor_msg["packet"] == "no packet id"
+        assert sensor_msg["data"]
+        assert sensor_msg["temperature"] == 8.26
+        assert sensor_msg["humidity"] == 76.2
+        assert sensor_msg["rssi"] == -62
diff --git a/docs/_devices/Relsib-WH52.md b/docs/_devices/Relsib-WH52.md
new file mode 100644
index 00000000..528c6f0b
--- /dev/null
+++ b/docs/_devices/Relsib-WH52.md
@@ -0,0 +1,17 @@
+---
+manufacturer: Relsib
+name: Portable temperature humidity sensor
+model: WH52
+image: Relsib-WH52.png
+physical_description: Portable temperature humidity sensor
+broadcasted_properties:
+  - temperature
+  - humidity
+  - rssi
+broadcasted_property_notes:
+broadcast_rate:
+active_scan:
+encryption_key:
+custom_firmware:
+notes:
+---
diff --git a/docs/assets/images/Relsib-WH52.png b/docs/assets/images/Relsib-WH52.png
new file mode 100644
index 00000000..92df750a
Binary files /dev/null and b/docs/assets/images/Relsib-WH52.png differ