ISO 4545-2 — Knoop hardness testing machine verification and calibration

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ISO 4545-2 is the international standard for verifying and calibrating Knoop hardness testing machines used on metallic materials. It confirms the machine performance that supports reliable Knoop results on thin sections, coatings, and brittle materials. To verify a Knoop tester or specify one, talk with our team.

What ISO 4545-2 Verifies

The standard checks the test forces, the elongated Knoop diamond indenter, and the optical system used to measure the long diagonal, together with overall machine performance confirmed against certified reference blocks.

Direct and Indirect Checks

Verification uses two methods together:

• Direct: checks of the applied forces, indenter condition, and the measuring system.
• Indirect: testing certified Knoop reference blocks and comparing readings against their certified values.

Why It Matters

Knoop testing is chosen where a shallow, elongated indent suits thin or brittle samples, so measuring accuracy is decisive. A current ISO 4545-2 verification keeps those results defensible.

Reading the Designation

Cited as ISO 4545-2:YYYY. Confirm the edition before setting verification intervals.

Related Standards

GB/T 4340.2 verifies Vickers machines, and GB/T 230.2 and GB/T 231.2 cover Rockwell and Brinell machine verification.

Request a Quote

Need a Knoop hardness tester verified or supplied? Request a quote and our team will help you build a system matched to your load range and verification needs.

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Equip your lab for ISO 4545-2 with TensileMill CNC

TensileMill CNC helps labs run ISO 4545-2 with repeatable, audit-ready results. Our range includes load cells, alignment hardware, and the reference setups used for machine and extensometer verification. Share your material mix and throughput, and we will recommend a setup that fits ISO 4545-2.