Features Independent Dial: The W‑20A Webster hardness tester adopts an independent dial, built in shrapnel type force transmission, provides accurate measurement, intuitive and clear reading. Mechanical Rule Design: The hardness durometer adopts mechanical rule design, equipped with pressure spring detection device, can be tightly connected and assembled. Simple Operation: The hardness meter is easy to operate, just follow the instructions, with high efficiency and good reliability. Lightweight and Portable: The hardness gauge is small in size, lightweight and portable, and can be easily held and used in various situations. Sturdy and Durable: The hardness tester is made of excellent iron material, which is sturdy and durable, not easy to be damaged, and can greatly extend the service life. Specification: Item Type: Metal Hardness Tester Material: Iron Application: Metal hardness measurement Range: 0-20HW Accuracy: 0.5HW Applicable Material: Aluminum alloy Hardness Range: 25-110HRE Sample Size:  Thickness: 0.6-13mm Inner Diameter: >10mm Package List: 1 x Metal Hardness Tester 1 x Hard Seat Protecting Loop (on the host) 2 x Hardness Block 1 x Spare Probe 1 x Probe Storage Box 1 x Correction Wrench 1 x Screwdriver 2 x Key 1 x Tool Box Package List 1 x Metal Hardness Tester 1 x Hard Seat Protecting Loop (on the host) 2 x Hardness Block 1 x Spare Probe 1 x Probe Storage Box 1 x Correction Wrench 1 x Screwdriver 2 x Key 1 x Tool Box