One counter reads in the plus direction and another in the minus directiion, so incremental measurement can be made in either direction
Carbide tipped scriber
Made of stainless steel (except the base).
With driving wheel. With dial test indicator holder.
Supplied with dust cover
Optional accessory: clamp for protracotors (code 2372-CLAMP)

3M 45013, Diamond Grade DG3 Reflective Digital Sheeting 4090UDS, White, 36 in x 50 yd, 1 Roll/Case, 7100282747
3M 05209, Hookit Sanding Block D/F, 70MM x 396MM, 7000028312
3M 97421, Aluminum Foil Tape 3380, Silver, 72 mm x 45 m, 3.25 mil, 7010375681
3M 64324, Foil Tape 3340, Silver, 72 mm x 45.7 m, 3.9 mil, 7010335734 