Shipping Policy : Battery and Liquid not included during the shipping Application: 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. Materials measured: hard materials, including steel, cast iron, aluminum, red copper, brass, zinc, quartz glass, polyethylene, PVC, gray cast iron, nodular cast iron and other ultrasonic wave well-conductive materials. Technical Specifications * Display: 4.5 digits LCD with backlight. * Operating principle: Ultrasonic * Measuring range (metric/imperial): 1.0-280mm,0.05-11.8inch (in Steel) * Sound Velocity Range: (500~9000) m/s. * Resolution: 0.1mm; * Accuracy: ±(0.5%n+0.2)mm, depends on materials and conditions * Power supply:4x1.5 AAA size (UM-4) battery（Battery not included in the package） * Battery indicator: low battery indicator *Operating conditions:0-40℃), humility ≤90％RH *Dimensions: Main Unit 140mm×60mm×22mm * Gloss Weight: 1KG * Standard Delivery: Main Unit,8mm Probe, User Manual ,Carrying Case Functions & Features * High resolution measurement * Probe automatic zero calibration for system error correction * Two-Point calibration function. Sound-Velocity-Calibration function * According to the known thickness measurement Sound-Velocity. * Capture the value of the minimum thickness. * Status indicator of the coupling and low battery. * Auto sleep and auto power off function to conserve battery life. * Humanized shape design, compact and portable, Can be used in harsh environment. *Large screen LCD display with high brightness backlight, easy to use in dim light environment.