ESAW Screw Gauge is an instrument that is used for measuring the diameter of thin wires, the thickness of small sheets such as glass or plastics. Screw Gauge are made from high stigma Brass and is Chrome Plated. Feeler Gauge Set 26 Blades .03 to 1.00 MM, Screw Pitch Gauge /Thread 4 to 62 TPI, 0.25 to 6.0 MM, SWG Wire Gauge & Circular Wire Gauge (PACK OF 4) ESAW SCREW GAUGE are used for precise measurement of a spherical or a cylindrical object, a screw gauge is the best instrument. ESAW Screw Gauge is an instrument that is used for measuring the diameter of thin wires, the thickness of small sheets such as glass or plastics. In another screw gauge there are 200 divisions on the thimble scale and screw advances 1 mm in a complete rotation of the screw cap. Who is more precise in measurement?