online hygrometer bluetooth hygrometer for android/ios temperature humidity meter indoor outdoor alarm

features: one. high precision: rh 0.54 rh and rh 3% rh with build-in swiss high sensor precision (sensirion). the precise sensor provides reliable data. 2. bluetooth thermometer: the detection scale is up to 164 feet (without obstacles) without obstructions. alerts will be sent to the application immediately if temp or humidity is beyond the default range. three. compact design: light lcd screen, smaller and more compact than others. you can check the current hygrometer and current and histor