MHLS-300 Portable Leeb Hardness Tester

The MHLS-300 is a portable Leeb hardness tester for fast, non-destructive evaluation of accessible in-service metal components. Developed by Laizhou Jincheng Industrial Equipment Co., Ltd., it helps maintenance, inspection, and quality-control teams collect hardness data directly on installed equipment, large workpieces, shafts, castings, forgings, and welded structures that are impractical to move to a bench tester.

For power, chemical, metallurgical, and general industrial maintenance tasks, the instrument combines Leeb rebound testing with directional compensation, hardness-scale conversion, record storage, and USB data transfer. Measurement suitability should be evaluated according to material type, surface condition, workpiece rigidity, geometry, and applicable test procedures.

Key capabilities for field maintenance

Mobile metal testing: approximately 230 g body and AAA battery power support inspection around equipment and workshop areas.
Multi-direction measurement: direction settings and compensation support top, side, vertical, and other accessible test positions.
Flexible impact devices: compatible with D, DC, DL, C, D+15, and G devices; D type is supplied as standard.
Digital inspection records: stores up to 1,000 measurements and transfers data by USB for maintenance files, analysis, or reporting.

Measurement workflow, technical parameters, and fit

MHLS-300 uses the Leeb rebound method to provide a practical hardness reference for routine screening, maintenance inspection, incoming inspection, and process checks. It automatically converts Leeb values to commonly used HRC, HRB, HB, HV, HSD, and MPa reference values, helping teams organize results across internal inspection records. Conversion results should be interpreted with the relevant material-specific conversion tables and standards.

Parameter	Specification
Test method / accuracy	Leeb rebound hardness test; ±6 HLD
Hardness conversions	HRC, HRB, HB, HV, HSD, MPa
Display / storage	160 × 128 backlit LCD; up to 1,000 records
Data and power	USB transfer; 4.5 V, 3 × AAA batteries; optional wireless mini printer
Size / operating environment	154 × 82 × 26 mm; approx. 230 g; -10 to 40°C, 20% to 85% RH

Suitable applications

Field checks on installed or heavy metal parts in power equipment, chemical plants, metallurgical facilities, machinery workshops, inspection agencies, and material laboratories.

Selection considerations

Confirm the component material, surface finish, thickness, rigidity, geometry, access direction, required scale, and whether an impact device beyond the standard D type is needed.

Practical inspection value

By reducing dependence on sample cutting and workpiece transport, MHLS-300 supports more efficient data collection while preserving traceable digital records for maintenance and quality documentation.

For teams that need portable hardness measurement on accessible in-service metal components, the MHLS-300 provides a compact and structured inspection tool. Laizhou Jincheng can support application-based configuration discussions to help users align the tester, impact device, and data-recording method with their actual inspection conditions.