Boeckeler Instruments Company was established in 1942 by Henry Boeckeler in affiliation with Arizona Tool and Die. Products at that time included mechanical micrometer heads accurate to ten millionths of an inch for use in the production of military aircraft during WWII. This degree of accuracy continues unmatched to this day. In 2000, Boeckeler acquires the RMC-EM product line of EM Sample Prep equipment from Ventana Medical Systems. Redesignated "RMC Products", the new line includes ultramicrotomes, cryosectioning systems, automatic EM tissue processors, glass knife makers, freeze substitution systems, and a wide range of associated accessories.