Fowler's Test Indicator & Mag Base Stand Features include... A 3-1/8" x 2-1/16" permanent magnetic base with on/off switch, fine adjustment on base and 5/16" x 9" upright. .0005" test indicator with .040", .080" & .120" contact points. Swivel clamp to mount indicator. Two dovetails stems: 5/32" & 3/8" A 4" hardened scriber. Form fitted shop-hardened case for easy accessibility and storage.