Federal MaraMeter Dimentron Indicating Plug Gage Through Hole EMP-.04383 In good working condition. Unknown date of the last calibration .. See pictures for cosmetic condition. • Designed for high production ID gaging. • High chrome content; hardened stainless steel bodies ground precisely for specified size measurement. • Plug tooling interchangeable for quick changeover • Easy measurement - insert plug into diameter and read (no rocking needed) • Set to nominal dimension with a single master ring. • Long life: Tungsten carbide contacts and V-Rod ensure durable motion transfer. Open design rinses clean easily. • Explore bores for taper, barrel shape, bell-mouth and 2-point out-of-round. • Stop Captive V-Rod design.