Precision Measuring & Testing

100+ products

Expected delivery: Tue, Nov 17

Precision measuring and testing tools for machine shops, maintenance departments and quality control. This section includes digital, dial and vernier calipers, outside micrometers, dial and test indicators with magnetic bases, thread pitch gauges, feeler gauges, radius gauges, drill gauges, infrared and probe thermometers, and other inspection tools.

What to check before you order

  • Range and resolution. Pick a range that covers your parts and a resolution finer than your tolerance.
  • Digital, dial or vernier. Digital reads quickly and switches units. Dial calipers need no battery. Vernier scales are simple and rugged.
  • Thread and feeler gauges. Thread pitch gauges identify inch and metric threads before you order taps and dies or fasteners. Feeler gauges set clearances and gaps.
  • Calibration. Tools used for quality checks should be verified on a schedule your quality system sets.
  • Care. Keep tools clean, closed and in their cases. Avoid dropping them, which can throw off readings.

For electrical meters and testers, see testers and meters. Browse all measuring and inspection tools or check the thread sizes guide.

Common questions

What is the difference between a caliper and a micrometer?

A caliper measures outside, inside, depth and step dimensions over a wide range and commonly reads to 0.001 in. or 0.01 mm. A micrometer measures one type of dimension over a short range per frame, often 1 in. or 25 mm, and gives finer, more repeatable readings for tight tolerances.

How do I zero a digital caliper?

Wipe the jaw faces clean, close the jaws fully without forcing them, and press the zero or origin button. Check that the display still reads zero after opening and closing the jaws a few times, and replace a weak battery if the reading drifts.

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