Designed for vaccine storage - Meets current CDC / VFC requirements and additional recommendations for vaccine storage and monitoring, 21 Part 11 Compliant. Easy to install - Built-in magnet, can be directly adsorbed refrigerator fixed. The advantage of the separable probe is that the probe no needs to be precooling after each time the device is moved. Glycol Bottle Buffered Probe - Avoid inaccurate temperature value caused by frequent door openings. With a wide measurement range temperature -40 to 185, humidity 10%~99%RH. Battery & USB Dual Power - Power on USB Port when battery is flat. Value Visibility - Current temperature and MAX MIN value can be obtained from the LCD screen. Parameter Settable - Temperature unit switch, Alarm Range, Logging Interval. color:As shown Material:ABS Package Contents: 1 x refrigerator thermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.