Please feel free to buy our products, we have excellent after-sales service. Specifications: Measuring Range: 1.2~225mm(steel) Accuracy: ±(1%H+0.1)mm, H denotes the measured thickness. Working frequency: 5MHz Resolution: 0.1mm Mininum limit for tube measuring(steel): Φ20 * 3.0mm(steel) Sound velocity Range: 1000~9999m/s Power supply: 3 * 1.5V AAA batteries (not included) Item Size: 15 * 8 * 3.8cm Color: Aas pictures show Package Contains: 1X Ultrasonic Thickness Gauge 1X Φ10mm 5HZ Transducer 1X 4mm Sampling Block 1X Operating Manual 1X box Features: Auto calibration to assure the accuracy. Auto linear compensation: this advanced software progr- am enhances the precision by correcting the non-linear accuracy of transducer. Use and keys to make a quick adjustment for the so- und velocity /thickness,and a quick recall to the stored data. Coupling status indication: Observing the coupling icon to learn if the coupling is accomplished or not. 10 thickness measurement storage and recall function available, which facilitates the height work or working in wild area. 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. 12 sound velocity for different material which also adjus- table. Low battery indication Auto power off mode designed to conserve battery life. More than 10000 times long lift keys. The unit has a special memory that retains all of its setting even when the power is off. Notes: Due to the difference between di If you do not understand, please send us an email.