Circumference Wheel, Product Type Circumference Wheel, Compatible Product Type Handheld Contact Tachometer, Compatible with Manufacturer Model Number DT-105A-S12, DT-107A-S12, DT-205LR-S12, DT-207LR-S12, DT-2100, Overall Height 3/4 in, Overall Length 12 in, Overall Width 4 in, Includes Not Applicable