Features: _x000D_1. Auto calibration to assure the accuracy. _x000D_2. Sound velocity measurement: with a given thickness to measure the sound velocity to improve accuracy. _x000D_3. Large LCD display for easy reading. _x000D_4. Low battery, auto power off function, etc. _x000D_5. Used in the field or work at heights _x000D_ _x000D_Specification: _x000D_Condition: Brand New _x000D_Model: GM100 _x000D_Measuring Range: 1.2-300mm(steel) _x000D_Accuracy: (1%H+0.1mm) H denotes the measured thickness _x000D_Working Frequency: 5MHz _x000D_Resolution: 0.1mm _x000D_Minimum Limit for Tube Measuring(steel): dia. 20*3.0mm(steel) _x000D_Sound Velocity Range: 1000-9999m/s _x000D_Color: Orange _x000D_Power Supply: 3 * 1.5V AAA Battery(not included) _x000D_Weight: Approx. 400g / 14.1oz _x000D_Size: Approx. 15 * 8 * 3.2cm / 5.9 * 3.2 * 1.3in _x000D_ _x000D_Package List: _x000D_1 * Ultrasonic Thickness Gauge _x000D_1 * Dia.10 Transducer(5KHz) _x000D_1 * 4mm Sample Block _x000D_1 * Operation Manual_x000D__x000D__x000D_Note:_x000D_Please note that the plastic boxes of the products are shipped randomly. 1Auto calibration to assure the accuracy. 2Sound velocity measurement: with a given thickness to measure the sound velocity to improve accuracy. 3Large LCD display for easy reading. 4Low battery, auto power off function, etc. 5Used in the field or work at heights