1,Measuring range :1.2 ~ 220mm (steel)/ 2,Measurement error : +/- (1% H +0.1) mm/ 3,Pipe measurement limit :D 20 X 3mm (steel)/ 4,Sound Velocity Range :1000 ~ 9999m / s/ 5,work Frequency :5MHZ/ 6,Operating temperature range: 0 ~ 45C/;7,Automatic zero calibration function: ok/ 8,Data storage function :ok/ 9,Automatic Shut Off :ok/ 10,Low power indication :3V +/- 0.2V/ 11,Power :3 X AAA NI-Cd or NI-Hm Battery/

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