1.High-precision and wide test range :This refrigerator thermometer Indoor temperature measurement range:-50C~+70℃(-58 F~+158 F) outdoor temperature measurement range:-50℃~+110℃(-58F~+230 F) temperature measurement accuracy: ±l℃( 1.8 F ) resolution:0.1 ℃(0.2 F) .Probe Wire length: 1.5 m(probe wire heat resistance up to 110 C). 2.The operation is simple:Insert the outdoor probe wire into the right interface of the temperatureThe LCD wil automaticaly switch between the outdoor(OUT)/indoor(IN)temperature display(conversion once every5 seconds)Loong press the SET button for 2 seconds .The high temperature alarm temperature value flashes, press 'adjustment' keys to adjust the temperature value.then press the SET key, the low temperature alarm temperature value flashes, press 'adjustment' keys to adjust the temperature value, and then press the SET key to confirm the setting. Note:The default high temperature alarm temperature is 28 ℃ , and thelow temperature alarm temperature is 18. 3.Exquisite and compact, with flexible placement options:Indoor /outdoor temperature display can set high /low temperature alarm function,°C/°F. It comes with a magnet and a multi - angle stand, making it suitable for a variety of scenarios. It can be used in kitchens, rooms, car refrigerators, pharmacy zers, bakeries, wineries, and for camping. It is an excellent choice for refrigerators, zers, indoor and outdoor thermometers. 4.Better reading:this refrigerator thermometer with a high - definition screen and clear digits, you can easily read the current temperature information of the refrigerator.