GM-100 Ultrasonic Thickness Meter Tester Gauge Velocity 1.2~225mm(Red) 1. The tool has wide measurement range from 1.20 ~ 225.00 mm (0.047 ~ 8.86 inch) with accurate measurements. Moreover, the meter has ultrasonic wave velocity measurement function from 1000 ms to 9999 ms. 2. This unit is widely used in various precise measurements for different hardware parts in industrial realm. One of its important applications is to monitor the level of thickness decreasing during operation of various and pressure container. 3. It is diffusely applied in manufacture fields, metal processing and commercial inspection. This product can be applied for the material that conduct and reflect constant sonic velocity 4. Auto Calibration to assure the accuracy 5. Auto linear compensation: this advanced software program enhances the precision by correcting the non-linear accuracy of transducer 6. Use "up" and "down" keys to make a quick adjustment for the sound velocitythickness and a quick recall to the stored data 7. Coupling status indication: Observing the coupling icon to learn if the coupling is accomplished or not 8. 10 thickness measurement storage and recall function available, which facilitated the height work or working in wild area 9. 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 10. 12 sound velocity for different material which also adjustable 11. Low battery indication 12. Auto power off mode designed to conserve battery life 13. More than 10000 times long life keys 14. The unit has a special memory that retains all of its setting even when the power is off 15. LCD Digital display: 4 digits 16. Minimum display unit: 0.1 mm 17. Working frequency: 5 MHz 18. Measurement Range: 1.2 ~ 225.0 mm (Steel) 19. Minimum limit for Tubes measurement: 20mm x 3mm (Steel) 20. Note: couplant (Not included) 21. Sound Velocity Range: 1000 ~ 9999 ms 22. Me