Product description Measuring Range: 0-1 inch or 0-25.4 mm Resolution: .0005" / .01mm Accuracy: .001" Base Size 2.75 inches by 0.30 inches Steel Probe Head Diameter: 0.080 inches Spring loaded plunger Lug on back to convert to indicator Large LCD for error-free reading in inch or mm On/off switch and powers off after 5 minutes of non use Converts between SAE and metric Zero button so can zero at any point in probe travel Powered by CR2032 button battery