Product Description

The ST-252D series integrated pen‑style Leeb hardness tester is a compact, all‑in‑one portable metal‑hardness measuring instrument. Adopting advanced dual‑coil sensing technology and a tungsten‑carbide impact body, the unit delivers outstanding testing precision and excellent repeatability. Its slim handheld build is perfectly suited for on‑site hardness inspection of work pieces, castings, shafts, fasteners and metal equipment components in workshops, machinery‑processing plants and outdoor working‑sites.

Product Features and Advantages

1. Seven‑in‑One Switchable Hardness Units

Seven commonly‑used metal‑hardness measuring modes are freely convertible on‑device, removing the need for manual conversion tables. Available measuring scales: HL (Leeb), HB (Brinell), HV (Vickers), HS (Shore), HRA, HRB, HRC (Rockwell A/B/C).

2. High‑Precision Dual‑Coil Detection Technology

Built‑in dual‑coil sensor assembly accurately captures the impact and rebound velocity of the striking body. Optimized hardware grants stable measuring accuracy and superior repeatability for long‑time frequent‑use scenarios.

3. Ultra‑Compact All‑in‑One Pen‑Shaped Structure

The integrated pen‑form body eliminates bulky separate host and probe parts. Light‑weight and pocket‑friendly, the tester can reach narrow surfaces, curved components and assembled machine parts for convenient field inspection.

4. 360° Automatic Angle Compensation

An in‑built orientation sensor automatically compensates measurement deviations from every impact angle. No‑manual setting is required when measuring upwards, downwards, horizontally or at inclined angles, unlike conventional hardness meters limited to 5 fixed testing directions.

5. Wear‑Resistant Tungsten‑Caride Impact Body

The striking indenter is manufactured from premium tungsten‑carbide material with extreme surface hardness, meeting national‑standard specifications. It performs stable, dependable detection for all kinds of hard metallic materials.

6. On‑Board Data Storage for 9 Groups of Readings

Up to nine groups of measured hardness records can be saved inside the tester. You can carry out repeated multi‑point sampling testing on metal specimens and check historical measurement data anytime.

7. Long‑Lasting Rechargeable Lithium‑Battery

Equipped with a 3.7‑V 250‑mAh built‑in rechargeable lithium battery. A full charge supports more than 5000 continuous hardness measurements. Type‑C USB charging interface brings easy, fast recharging.

How to measure the hardness with ZHIYI-252D hardness tester?

1.Load the Impact Assembly Slide the loading sleeve of the probe downwards to lock the tungsten‑carbide striking body in place.

2.Position the Probe Press the end face of the probe firmly and steadily against the clean, flat surface of the tested metal workpiece and hold the tester motionless.

3.Execute Hardness Measurement Press the release button located on the top of the probe. The device instantly computes and displays the metal‑hardness reading on the OLED panel.

Technical Data

Packing List