Electronic Pistol Grip Bore Gage Set for I.D. Measurement A pistol grip electronic bore gage allows for single handed operation with right or left hand viewing. The self-centering, 3-point head allows for highly accurate internal measurements. Specifications Include... 2.00" - 4.00" Measuring Range 0.0005" / 0.001mm Resolution Face Rotates 360° + 0.0002" Accuracy 4.48" Length of Measuring Head Package Includes... 4 Measuring Heads 1 Pistol Grip Body 1 Extension - 6" in length 2 Certified Setting Rings Features Include... Self-centering 3-Point head for higher accuracy Carbide tipped contact points Furnished with fitted aluminum case