Standard Pack = 1 piece(s). Type = Bore Gage ; Range = 3 - 3.5 Inch / 76.2 - 88.9 MM ; Accuracy = .0003 Inch ; Mass = 790 Gram ; Resolution = 0.0001 MM ; Contact Point = Carbide Or Titanium Coating ; Measuring Method = Three-Point Method ; Display = LCD ; Battery = SR44 ; Battery Life = Approx. 7,000 Hours ;