Indirectly measure the lamination rate of wood/building materials (gypsum board) by detecting the electrical conductivity of wood. Different length, For wood, the conductivity is different. The display shows the wood/building materials (gypsum board) rate data, and the error range is Within +/- 2% 8 calibration scales ( A , B , C , D , E , F , G , H ) , based on different types of wood materials Hold function to freeze the measurement Automatic Power-off in 3 minutes without operatione Used to find dark water leaks on walls and surfaces. The design has 2 high-precision pins, which can penetrate the test surface and quickly understand the moisture content in the wall, so as to estimate the potential of moisture growth in the entire house, which is very convenient to use. Display:LCD display with green color backlight Model:MT1903 Type:Wood moisture meter Accuracy:Wood:+/-2%; Building materials:+/-2%; Temperature:+/-2Celsius (+/-4Fahrenheit) Detection accuracy:+/-2% Temperature accuracy:+/-2Celsius Detecting wood humidity range:6%-60% Detecting building material (gypsum board) humidity range:1.5%-33% Ambient temperature:0Celsius-50Celsius (32Fahrenheit-122Fahrenheit) Power supply voltage:1.5 (V) Power supply mode:2 x AAA battery (not including battery) Colour:Black Material:Plastic Package Contents: 1 x Moisture detector 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.