Mitech MW-BB75a Webster Hardness Tester

Mitech MW-BB75a Webster Hardness Tester

Product Overview

The Mitech MW-BB75a Webster Hardness Tester is a compact, clamp-style hardness measuring tool designed specifically for aluminum alloys and related materials. As part of the MW series, this model offers accurate, non-destructive testing (NDT) on-site without the need for sample preparation or specialized training. The MW-BB75 is ideal for quality control in manufacturing, acceptance inspections, and field applications—especially in industries such as aluminum profile fabrication, windows, doors, curtain walls, and engineering projects.

Its ergonomic, handheld design and fast operation make it an essential tool for improving product qualification rates and reducing inspection costs.

Functions & Applications

• Evaluate whether a workpiece has undergone proper heat treatment

• Detect incorrect alloy compositions

• Test large, long, or heavy components that are difficult to sample

• Perform acceptance inspections in aluminum fabrication plants

• Used in quality control for window, door, and curtain wall manufacturers

• Suitable for engineering supervision and technical inspection agencies

Working Principle

The MW-BB75 uses the indentation method to determine material hardness. Under spring-loaded pressure, the tester creates an impression on the workpiece surface. The depth of this indentation is inversely proportional to the material’s hardness. The resulting hardness value, expressed in HW (Webster Hardness), can be directly read from the analog dial and converted to other standard hardness scales (e.g., HV, HR).

• If the hardness exceeds the upper limit, the pointer reaches 20 HW

• If the material is too soft, the pointer will stay at 0 HW

Key Features

• Rugged and corrosion-resistant: Maintains accuracy even after 4 hours in 5% saltwater and 100 drop tests from 0.5 meters

• Compact and portable: Lightweight and designed for one-handed operation

• Fast and non-destructive testing: No need to cut or alter the sample

• Easy to operate: Minimal training required and minimal operator influence on results

• Flexible testing: Suitable for parts of various shapes and sizes

• Accurate and reliable: Includes calibration sets for error correction

• Clear readings: Separate display avoids blocking the dial during testing

Operating Guidelines

• Check full-scale accuracy (20 HW) and calibration points regularly

• Ensure the sample is firmly seated and perpendicular to the indenter

• Apply consistent and firm pressure during measurement

• Avoid “air testing” to protect the red pointer from wear

• Keep the handle position stable during reading; align line of sight perpendicular to the dial for accuracy

• Prevent twisting of the workpiece during testing

• Do not attempt to disassemble the integrated meter head