Feeler gauge

Feeler gauge set (25 pieces, 0.03~1.0 mm measurement range)
Measuring the valve clearance of a DOHC engine, between camshaft and tappet (here: 0.004 in ≈ 0.10 mm).

A feeler gauge is a tool used to measure gap widths. Feeler gauges are mostly used in engineering to measure the clearance between two parts.[1]

  1. ^ Webster, Jay (2000). "3". Outdoor Power Equipment (Illustrated ed.). Cengage Learning. p. 40. ISBN 978-0-7668-1391-5.