Measuring & Inspection

300+ products

Expected delivery: Tue, Nov 17

Measuring and layout tools for carpenters, machinists, installers and quality inspectors: tape measures and rules, levels and squares, and precision measuring and testing tools such as calipers, micrometers, thread gauges, feeler gauges and thermometers. Whether you're laying out a wall, setting a machine or checking a part against a drawing, the right tool depends on how tight the tolerance is.

How to choose measuring tools

  • Match resolution to tolerance. A tape measure reads to fractions of an inch. Calipers typically read to thousandths of an inch, and micrometers resolve finer still. Pick a tool that reads well beyond the tolerance you need to hold.
  • Inch, metric or both. Dual-scale tapes and digital calipers that switch units help shops that work in both systems.
  • Check thread sizes with gauges. Thread pitch gauges confirm UNC, UNF or metric threads before you order fasteners. See thread sizes explained.
  • Levels by length and use. Torpedo levels fit tight spots, longer box beam levels span more surface, and magnetic edges free up a hand on steel.
  • Plan for calibration. Precision tools used for quality checks should be verified on a schedule set by your quality system.
  • Durability. Jobsite tools take drops. Look for tape cases and level frames that hold up, and store precision tools in their cases.

Equipping a quality lab, a machine shop or several service vans? We can quote mixed orders through our quote request form, and business accounts make repeat ordering simple.

Common questions

Calipers or micrometer, which should I use?

Calipers are versatile and measure outside, inside, depth and step dimensions. Micrometers measure one dimension type over a narrow range but are typically more precise, so they suit tight-tolerance work.

How do I measure a bolt's thread size?

Measure the major diameter with calipers, then use a thread pitch gauge to find threads per inch or the metric pitch. Our hex bolt grades guide covers the strength markings.

What's the difference between a framing square and a speed square?

A framing square is a large L-shaped square for layout on studs and stair stringers. A speed square is a compact triangle for marking cuts and common angles.

Measuring & Inspection by type

Measuring & Inspection: page 7