BENETECH GM130 Ultrasonic Thickness Meter Tester Gauge, Measure Range: 1.00~300.0mm This unit is an intelligent handheld product, which adopts ultrasonic measuring principle, and is controlled by microprocessor, provides quick and precise measurement of thickness for most of industrial material. This unit is widely used in various precise measurement for different hardware parts in industrial realm; one of its important application is to monitor the level of thickness-decreasing during operation of various and pressure container. Diffusely applied in manufacture fields, metal processing, and commercial inspection. Scope of application: This unit is suitable for measuring materials that are good ultrasonic conductor such as metal, plastic, acrylic, glass etc., as long as the measured part in two parallel surfaces for measurement of thickness. This unit is not suitable for cast iron due to its big crystalloid composition. Features and functions: 1. Auto calibration to assure the accuracy 2. Sound velocity measurement: with a given thickness to measure the sound velocity to improve accuracy 3. 12 sound velocities for different material 4. Coupling status indication 5. Preset 12 thickness measurement data store and recall 6. Thickness alarm setup 7. Backlight display 8. Low battery indication 9. Auto power off 10. Metric Imperial selection 11. Measuring mode selection Specification: 1. Measuring range: 1.0~300mm 2. Accuracy: +-(1%H+0.1)mm 3. Resolution: 0.01mm(1.00 to 99.99mm), 0.1mm(100 to 300mm) 4. Sound Velocity Range: 1000~9999ms 5. Working Frequency: 5MHZ 6. For Tube Measuring: Diameter 15 x 2.0mm( 6mm transducer), Diameter 20 x3.0mm (10mm transducer) 7. Power Supply: 3 x 1.5V AAA Batteries (Not Included)