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Choose a Portable Metal Hardness Tester
Portable metal hardness testing is for work that needs to be measured in the field — an installed shaft, a multi-tonne forging, a weldment that will never see a bench. The method here is Leeb rebound (ASTM A956 / ISO 16859), and once that is settled the decision is matching the instrument to the part: its mass, its geometry and how the result will be reported. The readings that get disputed almost always come from the same place — a specimen below the impact device's minimum mass, or a surface left unprepared — so treat adequate mass (or coupling) and a clean, ground footprint as part of the brief.
1. How to Choose
- Part mass and access — a heavy, solid part suits the standard D-type impact device; light, thin or confined-access parts need coupling to a backing mass or a different impact device (C-type for low mass, DL for narrow spaces).
- Reporting scale — decide which scale the certificate needs (native HL, or a converted HRC/HV/HB) and confirm the instrument carries the right material-group conversion.
- Be realistic about converted values — if the result has to stand in for a laboratory number, keep the reporting language clear about method and conversion.
2. Typical Product Fits
Two portable Leeb instruments cover most field work:
- Time 5150 — a compact, integrated D-type tester (HL, HRC, HRB, HRA, HV, HB, HS) reading 170–960 HLD, with 360° measurement and Bluetooth output. The straightforward general-purpose choice for solid steel parts, forgings and castings.
- Impact (TIME 5100 series) — offers different integrated impact devices (D, C and DL) to match specimen mass and access: D for standard solid parts, C for lighter components, DL for confined spaces. The choice when one impact geometry will not cover the range of parts you test.
3. Special Cases
- Thin-walled or light parts: couple them to a heavy backing mass with paste or clamping, or use the lower-energy C-type device — otherwise the part moves and the reading comes out low.
- Set the impact direction in the instrument (or confirm auto-detection); an uncompensated vertical-up reading is wrong.
- Prepare the surface to roughly Ra ≤ 2 µm — mill scale, paint and rough machining marks all scatter the reading.
4. Next Step
If the open question is which scale to report rather than which instrument to buy, continue to Select the Right Hardness Scale for Your Metal.
5. Related Knowledge
- Leeb Rebound Hardness — the rebound method and the impact-device types.
- Portable Metal Hardness Testing — surface preparation, coupling and field technique.
- Metal Hardness Scale Conversions — converting HL to HRC/HV/HB and the uncertainty involved.