Measurement range: 1.5 mm to 200 mm (in steel); range depends on test material and probe, applicable material: steel, lead, tin, other metals, etc; resolution: MG5: 0.1 mm; MG5-P: 0.01 mm; calibration: single point calibration; velocity range: 1000 m/sec to 9990 m/sec; V-Path correction: automatic V-Path correction for higher accuracy at lower readings; batteries: 5 no pencil dry cells (AA) or Ni-Cd; operating time: 100 hours (with alkaline cells); auto timer cut-off: instrument switch-off after 5 minutes of idle use; case: light aluminium sturdy case; size (approx): 80 mm (W) x 155 mm (H) x 38mm(D); weight (approx): 400 gms (including batteries).