Starrett 120B-12 Dial Calliper, Stainless Steel, Nib Style Jaw, White Face, 0-12" Range, +/-0.001" Accuracy, 0.001" Resolution

The Starrett 120B-12 Dial Caliper measures 0 to 12 inches with an accuracy of 0.001 inches and 3 inches spring jaws for heavy duty use or access to more measuring surfaces than traditional measuring legs. Jaws measure zero for external measurements and inside measurements of 0.300 inches. This handy measuring tool helps ensure re and accurate readings with the sharp, black gradations on the anti-glare satin strip, crisp lines on the white dial face and the knife edge contacts for external measurements. A full rotation of the dial corresponds to 0.100 inches. The knife edge contacts can be used to draw parallel lines on the workpiece. This measuring tube can be used with one hand by operating the fine adjustment roller with the thumb. The locking locks the pointer bezel and holds the sliding jaw in place. Unlike many calipers, the depth bar is integrated into the frame of the caliper, unlike many calipers that offer one or no removable depth bar. The hardened stainless steel components, including the rod, measuring surfaces, rack, gears and depth bar, provide corrosion resistance, increased accuracy and long service life. The anti-play control with positive split gear provides increased accuracy over standard transmission configurations. Game is the distance between the pasted gear teeth in the caliper controls, which prevents jamming of the gear teeth. Due to the lack of precision provided by the increased play between gears, it is undesirable to have a lot of play. Certain gear designs can minimize or eliminate the backlash. Split gear systems actually split the gear into two gears, each half the thickness of the original gearbox.