The Gauge Set measures creepage and clearance distances, distances through insulation and other spacings. The set can be used for compliance testing of electronic equipment and other products as required by all international standards. There are 32 gauges starting with very small distances for printed wiring measurements. The range is 0.5mm to 2.0 mm in steps of .1m; and 2.5 to 10.0 mm in steps of 0.5 mm. Tolerance on all gauges is +0 / -0.02 mm. The entire product is fabricated of stainless steel.