Comfortable buttons, convenient operation, and accurate detection. body, portable pen-style design is more comfortable to hold. LCD high-definition display, green backlight mode is not afraid of dark environment. The backlight can be turned off and on by long pressing the M key. Automatic shutdown prompt, the instrument automatically shut down if it is not used for more than ten minutes. Multi-material measurement: support , larch, birch, cherry, oak, pine Cement mortar layer, concrete, hard gypsum mortar, brick and other measurements. Battery type:2x1.5V AAA battery(without battery) Material Comparison Table: Material 1: The weight ratio of beech,,larch,cherry,walnut:8.5-60% Material 2: The weight ratio of oak,pine,maple,ash, ,and eucalyptus:6.8-53.4% Material 3: The weight ratio of cement mortar layer to concrete:0.9-24.5% Material 4: The weight ratio of anhydrous gypsum mortar layer:0.0-12.2% Material 5: The weight ratio of cement mortar:0.7-9.2% Material 6: The weight ratio of mortar to gypsum:0.5-11.0% Material 7: The weight ratio of bricks:0.0-17.8% Note:Due to different production batches, there are differences in lettering and printing screen printing, which not affect the use. Color:Red & Black Material:plastic Package Contents: 1 * meter 1 * Screwdriver(The color is random, and the designation is not accepted) 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.