Feature: 1. DIGITAL PROBE: Using advanced digital probe technology, digital signal processing is done directly on the probe, the probe is not susceptible to interference and provides excellent test accuracy. 2. DIRECTION SENSOR: Supports measurement at various angles of 360°, the probe has built in direction sensor, which can automatically compensate for measurement errors in different impact directions. 3. HARDNESS SCALE: Built in multiple hardness scales, HL, HV, HB, HS, HRA, HRB and HRC, users can directly select what they want inside the instrument, eliminating the tedious steps of manual table lookup. 4. CALIBRATION MODE: The measurement accuracy can be up to ±6HL, and the user can calibrate the instrument by himself. By calibrating the standard parts, the measurement error can be reduced. 5. STATISTICS MODE: The upper and lower limits of hardness value can be preset, with statistical mode, automatically count the maximum, minimum and average values ​​​​of the 9 values ​​​​recently tested. 6. OTHER FEATURES: The hardness tester adopts high brightness LCD screen, can read in the dark environment, uses 2 AA alkaline batteries(not included) , can work continuously for more than 100 hours. Specification: Item Type: Hardness Tester Probe Type: D Type Impact Device Hardness: HL, HV, HB, HS, HRA, HRB, HRC Measuring Range: HLD(170-960); HV(83-976); HB(30-651); HRC(17.6-68.5); HS(26.4-99.5); HRB(13.5-100); HRA(60-85.8) Resolution: 1HL Measurement Accuracy: ±6 HL Repeatability: 6HL Display: 240x160 dot array LCD Power Supply Method: 2 x AA alkaline dry battery (battery not included) Host Size: Approx. 142 x 72 x 28mm / 5.6 x 2.8 x 1.1in Probe Size: Approx. 148 x 31 x 25mm / 5.8 x 1.2 x 1in Operating Temperature Range: -10-50℃, 0-85%RH (non condensing) Storage Temperature Range: -10-60℃, 0-85%RH (non condensing) . Package List: 1 x Hardness Tester1 x Metal Test Block1 x Brush1 x Accessory Note: Avoid strong bumps causing irreversible damage.