Sound velocity range: 1000-9999 meter/second. Working frequency: 5MHz. Measurement Range: 1 ~ 200mm (Steel), the measurement range can be set, and beyond the setting range, an alarm sound will be emitted. Minimum display unit: 0.01 mm. Accuracy: (0.5% H + 0.05 mm). Measurement data count, record the maximum value, minimum value and average value of several measurement data. Observe the coupling during measurement to see if the coupling is complete. Display type: 2.4 inch LCD. Units of measurement: mm or inch. Overall dimensions: 65x146x30mm. Weight: 130g, perfect for easy storage and taking anywhere. Stores up to 500 readings and recall function. Two calibration methods. Sound velocity for different material which also adjustable. Capable of measuring materials, including steel, copper, aluminum, glass, plastic, ceramics, resin and much more. Diffusely applied in maunfature fields, metal procesing, and commercial inspection. It can also monitor pipes and pressure vessels in production equipment to monitor their degree of corrosion during use. Colour:black Material:ABS+metal Package Contents: 1 * thickness gauge 1 * sensor 3 * rechargeable batteries (1.2 V each) 1 * USB data cable 1 * charger (5V, 1A) 1 * hard carrying case Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.