Clark CPT Portable Hardness Tester
Last Calibration 11/18/2011. This will need calibration
Product Overview
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The Clark CPT is a portable, dial‑indicator Rockwell hardness tester designed for use in hard‑to‑access areas, capable of testing inside and outside surfaces at any angle with high accuracy Available in two variants:
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CPT: Compact model with limited throat and height.
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CPT‑XL: Extended version offering larger opening for bigger parts.
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🌟 Key Features
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Rockwell Scale Support: Measures across scales A, B, C, D, E, F, G, H, and K
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Speedy Indenter Changes: Quick‑change assembly allows rapid swapping of penetrators
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Finger‑Tip Loading: Easy manual load application via dial mechanism for precise testing
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Rugged & Lightweight: Designed to withstand harsh environments; weighs about 4 lb (CPT) and 15 lb (CPT‑XL) with full kit
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Standards Compliance: Meets ASTM E‑110 and ISO 17025 tolerances for Rockwell hardness testing
📐 Technical Specifications
| Specification | Model CPT | Model CPT‑XL |
|---|---|---|
| Minor Load | 10 kgf | 10 kgf |
| Test Loads | 60, 100, 150 kgf | 60, 100, 150 kgf |
| Supported Scales | A, B, C, D, E, F, G, H, K | Same |
| Vertical Capacity | 4.5 in (114 mm) | 12 in (305 mm) |
| Throat Depth | 2.25 in (57 mm) | 6 in (152 mm) |
| Weight (kit) | ~4 lb (1.8 kg) | ~15 lb (7 kg) |
🎒 Included in the Standard Kit
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Device (CPT or CPT‑XL)
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Calibrated hardness standard block (typically HRB)
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1/16″ carbide ball indenter (additional penetrators available)
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Flat anvil, V‑anvil, convex anvil
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Operating manual and conversion chart
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Carrying case for portability and protection







