BENETECH GT1201 Ultrasonic Thickness Meter Tester Gauge, Measure Range: 1.0-300mm 1. Used to measure the thickness of metal pipes, glass, plastics, etc. 2. With self-calibration function to ensure measurement accuracy 3. 1500 data storage 4. IPS full-view color screen display 5. You can set the alarm value and enable the over-value alarm 6. Lithium battery powered, long-lasting battery life 7. Can communicate with PC software via USB Specifications: 1. Measuring range: 1.0-300mm (steel) 2. Data storage: 1500 3. Working frequency: 5MHz 2.5MHz 4. Measurement error: +-(0.5%H+0.05)mm 5. Measurement resolution: 0.01mm (1.00-99.99mm) 0.1mm (100-300mm) 6. Pipe measurement lower limit: diameter 20 x 3mm (steel) 7. Sound velocity adjustment range: 1000-9999ms 8. Battery: 3.7V 1000mAh Li-ion battery 9. USB charging: 5V 1A 10. Dimensions: 150.6x65.3x35mm 11. Weight: 158g Package Contents: 1 x Ultrasonic Thickness Gauge 1 x Probe 1 x Portable Tool Box 1 x User Manual