Standard Pack = 1 piece(s). Type = Bore Gage ; Range = 1 - 2 Inch / 25.4 - 50, 8 MM ; Display = Interchangeable Head Set ; 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 ; Set Includes = Display Unit-568-015, Adaptor Supplied-954595, Individual Head No.-04AZB139,04AZB140,04AZB141, Setting Rings Included-177-179,177-283 ;