Mitech MW-20b Webster Hardness Tester

Product Overview

The Mitech MW-20b is a portable Webster hardness tester designed specifically for aluminum and aluminum alloy materials. Known for its clamp-type design, this handheld tester allows fast, on-site, non-destructive testing (NDT) without the need for cutting samples or specialized skills. It provides immediate hardness readings and helps verify heat treatment effectiveness, alloy composition, and overall material quality.

Widely used in aluminum manufacturing, construction, and product quality inspection—especially in window, door, and curtain wall fabrication—the MW-20 is a reliable tool for quality control, engineering acceptance, and cost-saving process optimization.

Functions & Applications

• Determine whether a workpiece has undergone heat treatment

• Verify correct alloy usage

• Inspect long or heavy parts not suitable for standard hardness testing

• Perform project acceptance in aluminum factories and construction sites

• Commonly used by aluminum window, door, and curtain wall manufacturers

• Suitable for quality control departments and technical inspection agencies

Working Principle

The MW-20 operates based on the indentation principle, where hardness is inversely proportional to the depth of indentation. The device applies force to the test surface using a spring-loaded punch. The resulting reading (in HW – Webster Hardness) is shown on an analog dial, which can be converted to other hardness scales (HV, HR) if needed.

• 0 HW indicates extremely soft material or incorrect positioning

• 20 HW is the full-scale maximum

Key Features

• Portable and lightweight: Operates with one hand, ideal for rapid field testing

• Non-destructive testing: No sample cutting required, preserves the integrity of the workpiece

• User-friendly: Minimal skill required, making it ideal for production environments

• Adaptable: Can test parts of various shapes and sizes

• Durable design: Withstands 100 drops from 0.5 m without pointer deviation

• Corrosion-resistant: Survives 4-hour exposure in 5% saltwater with no loss of accuracy

• Separate dial display: Prevents obstruction of readings during testing

• Calibration set included: For quick error correction and maintenance of precision

Operating Method & Safety Notes

• Ensure the sample surface is perpendicular to the indenter and in full contact with the anvil

• Apply firm and consistent grip force during testing to avoid under-readings

• Avoid twisting the workpiece while testing to prevent pointer damage

• Do not “air test” the device, as this may wear down the red indicator needle

• Hold the handle steady until the pointer stabilizes; view the dial straight on to reduce parallax error

• Do not attempt to dismantle the meter head, as it is an integrated precision component

Maintenance Guidelines

• Keep clean: Use a soft cloth to remove dust or stains, especially from the dial

• Prevent rust: Store in a dry place, and avoid water exposure

• Avoid impacts: Precision parts may suffer permanent damage from drops

• Do not disassemble: Internal components are factory-calibrated—refer to qualified service personnel for repairs

• Store safely: Use the original case for protection when not in use