Applications: Used for measuring thickness and corrosion of pressure vessels, chemical equipment, boilers, oil storage tanks, etc. in industries of petroleum, shipbuilding, power station, and machine manufacturing. Applicable to measure the thickness of many materials, e.g. Steel, Cast iron, Aluminum, Red copper, Brass, Zinc, Quartz glass, Polyethylene, PVC, Gray cast iron, Nodular cast iron. Features: * Multi-mode: Pulse-Echo mode (used for flaw and pit detection) and Echo-Echo mode (used for measurements eliminating paint or coating thickness). * With high power of emission and broad band of receiving sensitivity, the gauge can match probes of different frequencies. That makes it easy to measure the rough surface, even cast iron. It is widely used in almost all kinds of industries. * Automatic memory material code and sound velocity value, convenient to use. * Coupling symbol indication when measuring. * Manual or automatic power off. * Applies USB, RS-232, Bluetooth data output.  Principle& 65306; The digital ultrasonic thickness gauge determines the thickness of a part or structure by accurately measuring the time required for a short ultrasonic pulse generated by a transducer to travel through the thickness of the material, reflect from the back or inside surface, and be returned to the transducer. The measured two-way transit time is divided by two to account for the downand-back travel path, and then multiplied by the velocity of sound in the material. Specifications:                Unit System                 Metric system or British system (optional)                     Display                 LCD with backlight                     Range                 Pulse-Echo mode: (1.0~300)mm (in Steel)                     Echo-Echo mode: (3~30)mm                     Resolution                 0.1mm / 0.01mm / 0.001inch                     Accuracy                 ±(0.5%n + 0.