Performance parameters: Metric ratchet type locking device ─ measuring range with a scale value No. precision 0-25mm103-1370.01mm ± 2μm103-1290.001mm ± 2μm25-50mm103-1380.01mm ± 2μm103-1300.001mm ± 2μm50-75mm103-139-100.01 mm ± 2μm75-100mm103-140-100.01mm ± 3μm100-125mm103-141-100.01mm ± 3μm125-150mm103-142-100.01mm ± 3μm150-175mm103-143-100.01mm ± 4μm175-200mm103-144-100.01mm ± 4μm200-225mm103 -145-100.01mm ± 4μm225-250mm103-146-100.01mm ± 5μm250-275mm103-147-100.01mm ± 5μm275-300mm103-148-100.01mm ± 5μm300-325mm103-1490.01mm ± 6μm325-350mm103-1500.01mm ± 6μm350-375mm103 -1510.01mm ± 6μm375-400mm293-1520.01mm ± 7μm400-425mm103-1530.01mm ± 7μm425-450mm103-1540.01mm ± 7μm450-475mm103-1550.01mm ± 8μm475-500mm103-1560.01mm ± 8μm inch type with a ratchet locking device ─ measuring range Item division value precision 0-1'103-177 .001 '± .0001 '103-131 .0001' ± .0001 '1 '-2 '103-178 .001' ± .0001 '103-132 .0001 '± .0001 '2' - 3'103-179 .001 '±