Vernier caliper calibration in Perth

Calipers are the most-used dimensional instrument in any Perth workshop and the one most likely to have been dropped, over-tightened or used as a scribe. AmpTech calibrates vernier, dial and digital calipers in our Caversham lab against traceable gauge blocks, checking external, internal and depth measurement at points across the range.

Types of vernier and digital calipers we calibrate

• Vernier calipers (0–150 mm to 0–1000 mm)
• Dial calipers
• Digital calipers
• Long-jaw and offset calipers

What the calibration covers

• External measurement against gauge blocks at points across the range, including zero and full span
• Internal (inside jaw) measurement against a gauge block stack
• Depth rod measurement against a known step
• Jaw parallelism and closure — light gaps at the tips show up as errors on small parts
• Beam straightness and slide condition, and the zero setting on digital models

Parameters measured

Why vernier and digital calipers drift

Calipers wear at the measuring faces and pick up damage at the jaw tips. A dropped caliper can spring the beam or the slide, and dirt in the rack of a dial caliper introduces jumps. Digital calipers add battery and electronics drift. Most errors show up at the extremes of the range or on small dimensions at the jaw tips, which is where a calibration concentrates its checks.

What your certificate records

• As-found and as-left readings at each length checked, for external, internal and depth
• Jaw condition and parallelism observations
• Gauge blocks and reference standards used, with their traceability
• Environmental conditions at the time of calibration

References we work to

• Manufacturer's published accuracy specification for the model and range
• ISO 9001 clause 7.1.5 — monitoring and measuring resources
• Your drawing tolerances — the caliper should resolve well inside them