Expansion gauge inner diameter gauge 8-150mm 5/16-6 inch expansion gauge measuring tool plug gauge measuring tool expandable gauge

Telescopic gauge is used to measure the inner diameter or internal through groove of the machine by comparison. Made of high quality steel, durable. Six telescopic gauges with different specifications can be used to quickly measure the inside of the hole. Under the uniform spring tension, the plunger of the measuring tool expands from the center to the diameter or groove width of the hole to be measured, and then locks it in place with the knurled knob. The hole size can be obtained by measuring two contact points with a micrometer or caliper. Portable and practical, easy to operate. SCOPE OF APPLICATION: The telescopic spring piston in the hole (or ) can be used for inner diameter detection, used in conjunction with a micrometer or caliper, and has a knurled locking device.