Features& 65306; 1. Auto calibration to assure the accuracy. 2. Auto linear compensation: this advanced software program enhances the precision by correcting the non-linear accuracy of transducer. 3. Use and keys to make a quick adjustment for the sound velocity /thickness,and a quick recall to the stored data. 4. Coupling status indication: Observing the coupling icon to learn if the coupling is accomplished or not. 5. 10 thickness measurement storage and recall function is available, 6. which facilitates the height work or working in wild area. 7. Sound velocity measurement: With a given thickness by a sample hardware to measure the sound velocity, which avoid the further conversion or     consultation of the table. 8. 12 sound velocity for different material 9. Low battery indication 10. Auto power off mode designed to conserve battery power. 11. More than 10000 times long lift keys. 12. Manual power off Specifications& 65306;       Display         4-digital LCD Display         Minimum Display Unit     0.1 mm         Measuring Range     1.2 to 225.0mm (Steel)         Working Frequency     5MHz         Accuracy     (1%H+0.1)mm,H denotes the measured thickness.         Minimum Limit for Tube Measuring     20*3mm (Steel)         Sound Velocity Range     1000 to 9999 m/s         Measuring Sound Velocity with a Given Thickness     Measuring Range: 1000 to 9999 m/s. When the given thickness > 20mm, the accuracy is +/-5%; when the given thickness < 20mm, the accuracy is +/-1mm/H*100%.         Operation Condition    Temperature: 0°C~40°C Relative humidity: <90%RH Hardware/workpiece/material temperature: <60°C         Operation Current                                                                    Normal Operation Current: 50mA With Backlight Turn on Current: 120mA Stand-by Current: 20uA         Packing Contents                                                                                       Main Unit-1PCS  Transducer-1 PCS(10mm 5MHz ) Coupling Agent-1PCS(50ml) 4mmSample Block-1PCS         Power Supply     1.