This is a handheld microprocessor-controlled thickness gage specifically designed for measuring metallic and non-metallic materials such as steel, aluminum, titanium, plastics, ceramics, glass and any other good ultrasonic wave-conductor with parallel top and bottom surfaces. Features include... Used in many areas of industry. Extremely easy to use Can perform precise measurements on various types of raw materials, component parts and assembled machinery. Can also be used to monitor all types of pipes and pressure vessels for loss of thickness due to corrosion or erosion. After a simple calibration to a known thickness or sound velocity, the gage will give accurate readings in inch or millimeters. Includes: base unit (w/built in calibration block), 5 MHz dual sensor probe, 2 oz bottle of couplant gel, AAA battery set, operation manual and carrying case. Specification include... Display Type: Large 4-digit LCD Min Display Unit: 0.001" / 0.1mm Measuring Range: 0.04 - 8" (0.1mm - 200mm) in steel w/standard probe (other values depending on material) Low Limit Steel Pipes: Min dia 0.8" x 0.1" (20 x 3mm) Display Accuracy: + 0.01mm Sound Velocity Range: 1640 - 29,527 Ft/S (500 - 9000 m/s) Operation Temp: 32 - 122° F (-5 - 40° C) Frequency: 5 MHz Update Range: 4 Hz Power Supply: 1.5v AAA alkaline batteries (4) Battery Life: Approx 250 hours Dimensions: 4.9" x 2.6" x 0.9" Weight: 0.7 lbs