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Cometech QC-557 Short Extensometer | Metal & Hard Plastic | 0.5 μm Resolution | 25/50mm Switchable Gauge | <100% Elongation
- Short extensometer designed for measuring deformation in metal, hard plastic, and rigid materials with elongation below 100% — stays clamped on specimen for the full duration of the test including to specimen break, without removal; compatible with Cometech UTMs and other brands of testing machines.
- Switchable gauge length: 25mm (max 100% elongation) / 50mm (max 50% elongation); resolution: 0.5 μm; max output frequency: 64 kHz; input voltage: DC 5V ±5%.
- Adjustable clamping force accessory included — prevents slippage during test; clip accessory included for flat or round bar specimens; ships with factory calibration certificate.
- Industries: Polymer, Rubber, Metal; applications: tensile testing, modulus measurement, yield point determination on rigid and semi-rigid materials.
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Overview
The Cometech QC-557 Short Extensometer is purpose-built for rigid and semi-rigid materials — metal, hard plastic, and similar substrates — where elongation does not exceed 100% at 25mm gauge length or 50% at 50mm gauge length.
The robust mechanism and high-precision read head deliver 0.5 μm resolution, and the design allows the extensometer to remain clamped on the specimen for the entire test including fracture, eliminating mid-test removal risk and operator interference.
Switchable gauge length (25mm / 50mm), adjustable clamping force, and compatibility with flat and round bar specimens make it a versatile standard accessory for Cometech UTMs as well as third-party testing machines.
Key Features
- Designed for metal and hard plastic — measures elongation up to 100% (at 25mm) or 50% (at 50mm gauge length).
- Resolution: 0.5 μm — high-precision deformation capture for modulus and yield point analysis.
- Switchable gauge length: 25mm / 50mm — two ranges in one unit, no separate purchase required.
- Remains clamped to specimen through full test to fracture — no mid-test removal needed.
- Adjustable clamping force accessory — prevents slippage on smooth or coated specimen surfaces.
- Clip accessory included — fits both flat (sheet/film) and round bar specimens.
- Ships with factory calibration and inspection certificate.
- Max output frequency 64 kHz; input voltage DC 5V ±5% — compatible with Cometech machines and other UTM brands.
- Customized longer variants available when standard gauge length or elongation range is insufficient.
Full Specifications
| Model | QC-557 |
|---|---|
| Type | Short Extensometer |
| Applicable materials | Metal, hard plastic, and rigid/semi-rigid materials with elongation <100% |
| Gauge length | 25 mm / 50 mm (switchable) |
| Max elongation | 100% at 25mm gauge length 50% at 50mm gauge length |
| Resolution | 0.5 μm |
| Max output frequency | 64 kHz |
| Input voltage | DC 5V ±5% |
| Specimen type | Flat (sheet / film) and round bar specimens |
| Clamping | Adjustable clamping force accessory included |
| Calibration | Factory calibration and inspection certificate included |
| Compatible machines | Cometech UTMs and other brands of testing machines |
| Custom option | Extended gauge length available on request |
| Industries | Polymer, Rubber, Metal, Pipe, uPVC & Window Profiles |