Measuring range:1.2 ~220Millimeter(Steel) Accuracy:(1% H +0.1) Mm Resolution:0.1mm Velocity range:1000 ~ 9999m / s Operating frequency:5MHz Pipe Measuring limit:203mm(Steel) Automatic proofreading zero system error correction Linear automatic compensation, in the full range of computer software to probe nonlinear error correction to improve the accuracy Data storage/Data Query/Data delete function Measuring the speed of sound: According to the sample block thickness directly measured the speed of sound Low power indication function Auto power off function LCDBacklight function Power Supply:3 Festival1.5V AAABattery (Not Included) Product NW:220Gram Size:1457235Millimeter