From micro- + caliper.
microcaliper (plural microcalipers)
- A very small caliper
2015 August 29, “The Inhibitory Effects of Low-Dose Ionizing Radiation in IgE-Mediated Allergic Responses”, in PLOS ONE[1], →DOI:After 24 h, the thicknesses of the ear and hind paw were measured using a digital microcaliper.