3900A Electronic indicators

An economical indicator that delivers the high accuracy and reliability users expect from Starrett tools.

Shop 3900A Electronic Indicators

AGD GROUP 2
RANGES UP TO 1” AND 25.4MM

The 3900A Electronic Indicators have simple, powerful, easy-to-use functions, all at an attractive price. Available in inch/metric (3/8” stem, 4-48 screw thread) and metric/inch (8mm stem, M2.5 x 0.45 screw thread)


  • Large, easy-to-read LCD
  • Reverse travel (± control indicates direction)
  • Zero setting at any position
  • Long battery life
  • 3/8” diameter stem for inch/mm model (8mm on metric-only model)
  • #4-48 contact point thread size on inch/mm model (M2.5 x .45 thread on metric-only model)
  • Lug-on-center back with additional flat back
  • Dust cap
  • Plastic storage case with fitted foam insert
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