LotFancy Digital Ultrasonic Thickness Gauge Tester Meter, Range 1.2-220mm, with Hard Storage Box VERSATILE USES: Ultrasonic thickness tester measures sound velocity with a given thickness, capable of measuring variety materials, including steel, copper, aluminum, glass, plastic, ceramics, resin, PVC, water and much more RELIABLE ACCUARCY: Auto zero calibration assures the accuracy; auto calibration enhances the precision and coupling indicator ensures correct measurement DATA STORAGE AND RECALL FUNCTION: 10 groups thickness measurement storage allows for convenient use in various working conditions SPECIFICATIONS: Backlit LCD digital display: 4 digits; minimum display unit: 01 mm; Measurement Range: 1.2 -225.0mm (steel); Accuracy: (1%H0.1mm); Sound velocity:1000~9999m/s; Minimum limit for tubes measurement: 20 x 3 mm (Steel) READY to USE OUT OF BOX: 3 AAA batteries, bottle of 50ml couplant and 4mm thickness gauge calibration block are also included in the package; LotFancy offers 1-Year Warranty and money-back satisfaction guarantee