Multi-tip compatibility: The hardness tester is available with three interchangeable pen tips (0.5mm, 0.75mm, and 1mm) to accurately measure and record hardness levels on flat or curved surfaces of any size. Measurement technique: Draw a vertical line of 10-20mm on the surface at a speed of 10mm/s to determine if the surface hardness is below the Newton scale of the tester. Display accuracy range: The tester shows an accuracy scale in Newtons after selecting different test ranges. Color codes indicate varying ranges: blue for 0-3N, red for 0-10N, and yellow for 0-20N. Integrated design: To use the tester, place the probe at the center of the cap end, which screws onto the device for a secure and seamless unit. Service: We place great emphasis on our customers' shopping experience. If you have any questions, please feel free to contact us; we will respond to you within 24 hours!