Professional 0-1 inch (approximately 0.3 cm) dial inst ent, 0.001 inch (approximately 0.001 cm) resolution, which is very suitable for mechanical processing, automotive and industrial jump measurements. 9 inches (approximately 24.4 cm) adjustable arm with a micro-adjustment knob to stable positioning on curved surfaces or on narrow spaces. Strong double-sided magnets (on/off control) can withstand weights up to 50 lbs and are compatible with vertical/horizontal mounting of steel surfaces. Includes 22 test heads (carbide tip), 1/4inch and 6.3mm adapter and shockproof housing. Color: As Shown Material: Metal Package Contents: 1pcs x dial indicator with magnetic base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.