Starrett Digital Indicator The 3900A Series Electronic Indicators have simple, powerful, easy-to-use functions, all at an attractive price. Converts inches / metric with the press of a button. Ships with flat back installed, and includes a lug-on-center back as an accessory. Features include... 0-1" / 25.4mm Measuring Range 0.0005" / 0.01mm Resolution + 0.001" / + 0.03mm Accuracy 3/8" Stem Diameter Includes Lug & Flat Backs 4-48 Threaded Tip
