Measurement instructions:1. Remove the battery cover, install 2 AAA dry batteries, and pre the power button once to turn on the machine. This product has a blue backlight after it is turned on, which can be clearly displayed when the light is insufficient. 2. Remove the electrode needle cap to expose the electrode needle. 3. Pre the "Wood" button to select the appropriate wood calibration scale A, B, C, D (please refer to the wood calibration table at the back of this guide) to measure the corresponding wood. 4. Pre the "Paper" or "Wall" key to select paper mode or wall mode. Paper mode is used to test paper/cardboard/carton. Wall mode is used to test thin slate/wall board/floor. 5. Insert the needle into the material and read the currently displayed data. Pre and hold the HOLD/C/F key once to lock the display reading. 6. Read the current ambient temperature. Pre and hold the HOLD/C/F key for 3 seconds to switch between Celsius and Fahrenheit. 7. Pre the power button once to turn off the power of the instrument. Specifications:Principle:Resistive Wood range:4~75% Paper range:4~90% Wall range:0.2~24% Resolution:0.1% Accuracy:0.5% Electrode length:10mm (0.4") Electrode needle:integrated Automatic shutdown:after the button is not operated for 5 minutes Power supply:2 AAA batteries Product material:ABS Operating temperature:0 to 40 degrees Celsius (32 to 104 degrees Fahrenheit) Product size:144 X 64 X 31mm (5.7" x 2.5" x 1.2") Product weight:130g List:1*Moisture meter (without battery) 1*Instruction