Specifications: LCD Display With Backlight Principle:Electrical resistance 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 pins:Integrated Auto Power OFF:After approx.5 minutes Power Supply:2*AAA batteries Meter housing:ABS plastic Operating Temperature:0 to 40 (32 to 104) Dimensions:145 X 67 X 32mm (5.7" x 2.6" x 1.3") Weight:200g (7.0 oz) Wood Species Group Table: A:Teak, Walnut, Afrormosia, Rubber Tree, Imbuia, Kokrodua, Niove Bidinkala, Cork B:Keruing, White Poplar, Beech, Cedar, Tola C:Lauan, Ash, Elm, Fir, Maple, Padauk, Oak, Cherry D:Bawood, Larch, Pine, Birch PAPER MODE: Cardboard, Carton, Paper WALL MODE: Sheetrock, Wall Board, Floor kindly remind: 1>We always have enough products in stock. 2> We are factory over 8 years, OEM offered, welcome your big order! 3> Allthe parcels was sentby registered Airmail with valid tracking number.We will track it until you get the parcel. 4>All of our products are under 1 year guarantee. 5> We offer your choice with and without rechargeable battery , You can choose the model with or without rechargeable battery.