Horex outside micrometers 001mm accuracy horex 2304 513 the horex outside micrometer 25 50mm 001mm accuracy has a strong one piece steel frame along with several excellent features including satin chromed reading parts carbide tipped measuring surfaces and a 05mm pitch the setting standard is from 25mm upwards while the spindle diameter is 65mm horex 2304 513 outside micrometer 25 50mm 001mm accuracy