Standard Pack = 1 piece(s). Type = Bore Gage ; Range = 30 - 40 MM ; Accuracy = 6 Micrometer ; Mass = 565 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 ;