Accuracy according to DIN 863 / 3. Temperate areas of contract and lapped ø mm 7. Drum ø 20 mm. Micrometer screw temperate and corrected sums 1, in alloy steel other resistance. Screw sensitive. Read matt chrome surfaces. Reading 1 / 100 mm. Locking screw to a predetermined extent. 60 mm dia meter of the disk. Packed in carton. Profit 0 ÷ 15 mm. Depth 50 mm arc.