Specifics: Measuring range: 1.00225.0mm Data storage: 500 Operation frequency: 5MHz Measurement error: ( 0.5%H+ 0.05) mm Lower limit of pipe measurement: 20x3mm (steel) Adjustment range of sound speed: 10009999m/s Temperature range of operation: 040 Battery: 3 Ni-MH rechargeable batteries of 1.2V USB charging: 5V 1A Dimensions: 65x146x30mm Feature: 100% new with high quality Auto calibration to assure the accuracy. Make a quick adjustment for the sound velocity. Coupling status indication: Observing the coupling icon to learn if the coupling is accomplished or not. Thickness measurement storage. Sound velocity measurement. 12 sound velocity for different material which is also adjustable. Thickness alarm setup. LCD backlight display. Low battery indication and auto power off. Limit value function. Friendly Tips Due to manual measurement , there may be 1-3cm deviation exist,hope you can understand. There are slight difference between the picture and the real item caused by light brightness,hope you can understand. Package includes: 1x WT100A Digital Ultrasonic Thickness Gauge 1x Probe 1x Retail Case 1x Charger 1x Manual