Metric External Micrometers

Enamelled frame and tungsten carbide tipped anvils. Manufactured to BS 870.
Supplied in a durable plastic case.
Flatness: 0.6mm.
Parallelism: (2 + L/100) µm
(fraction rounded down).
Instrumental error: ±(1 + L/75) µm
(fraction rounded up).
L = maximum measuring length