- The anvil and spindle have a small diameter for measuring splined shafts, slots, and keyways.
- With Ratchet Stop for constant force.
- With SPC output
- With a standard bar except 0-1” model.
- Carbide tipped Measuring faces:
- Battery life*: Approx. 1.2 years under normal use
- Dust/Water protection level*: IP65
- MeasurLink Enabled
- Type A & B anvils available (see below)

Mitutoyo - Digital Spline Micrometers - (IP65) - 331 Series - (Metric)
| Item No. | Range | Anvil Dia.- Length - Type | Graduation | MSRP | Our Price | QTY |
|---|---|---|---|---|---|---|
| 331-251-30 | 0 - 25mm | 3mm Dia. x 10mm L - Type A Anvils | 0.001mm | $609.40 | $548.90 | |
| 331-261-30 | 0 - 25mm | 2mm Dia. x 5mm L - Type B Anvils | 0.001mm | $609.40 | $548.90 | |
| 331-252-30 | 25 - 50mm | 3mm Dia. x 10mm L - Type A Anvils | 0.001mm | $685.30 | $617.10 | |
| 331-262-30 | 25 - 50mm | 2mm Dia. x 5mm L - Type B Anvils | 0.001mm | $685.30 | $617.10 | |
| 331-253-30 | 50 - 75mm | 3mm Dia. x 10mm L - Type A Anvils | 0.001mm | $711.70 | $640.20 | |
| 331-263-30 | 50 - 75mm | 2mm Dia. x 5mm L - Type B Anvils | 0.001mm | $711.70 | $640.20 | |
| 331-254-30 | 75 - 100mm | 3mm Dia. x 10mm L - Type A Anvils | 0.001mm | $858.00 | $772.20 | |
| 331-264-30 | 75 - 100mm | 2mm Dia. x 5mm L - Type B Anvils | 0.001mm | $858.00 | $772.20 |