function:ON/OFF: switching function/: in the display temperature state, press this button to perform the function of / conversion.HOLD key: in the display temperature state, press this button to keep the display value of LCD in HOLD state, and press again.Once the temperature detection is restored. When the HOLD function is executed, the HOLD conforms to the LCD. Specifications:Model:PT101Material:stainless steel Type: food thermometer (Electronic)Size :22.6*2cm/8.9*0.79"Weight :0.04kgHumidity range:non hygrometerTemperature range: -50~+300(-58'F~+572'F)Precision grade:±1.5 Note: Light shooting 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.