Digital Indicator, .500"/12.5mm Range, .001"/0.01mm Res., 3/8" Stem Diameter. The 3900 Series Electronic Indicators have simple, powerful, easy-to-use functions, all at an attractive price. The 3900-5 has a .500" (12.5mm) range, .0005" (0.01mm) resolution and 3/8" stem diameter and a #4-48 spindle thread. Converts inches / metric with the press of a button. Ships with flat back installed, and includes a lug-on-center back as an accessory, along with a plastic storage case.
Long battery life. Simple, powerful, easy-to-use functions, all at an attractive price. Plastic storage case with clear cover. Plastic storage case with clear cover. Large, easy-to-read LCD. Lug-on-center back + additional flat back. Zero setting at any position. Power On / Off button. Reverse travel (+/- control indicates direction). 3/8" diameter stem.