Test Indicators Test indicators translate small linear distances into rotational movement to measure dimensions to 0.060", accurate up to 0.0001". They are typically fixed to a magnetic base or other Starrett fixture. Specifications for this product Colour White UNSPSC Code 41111630 Item Diameter 1.57 inches Ean 0049659125276 Graduation spectrum 0.030 inch Graduation interval 0.0005 inch Maximum measurement 0.030 " Brand name Starrett Number of items 1 Global Business Identification Number 00049659125276 Model number 3909A Part number 3909A Product weight 8.0 ounces Rank 0.030 " Resolution 0.0005 " Size 2 Attachments, White Dial, 1.57 "Dia., 0.030" Range, 0.0005 "Graduation Screen type Dial CPU 049659125276 Item volume 42.00 cubic_inches