A high precision Abbe 3L optical refractometer manufactured by Bausch & Lomb, 6″ x 12.75″ x 10.5″, consisting of upper eyepiece, thermometer, compensation dial, adjustment wheel, on/off scale display switch, illuminator arm with lamp, and assembly with measuring and illuminating prism. Manufacturing plate to reverse reads: "Cat. No. 33.46.10, Serial No. 0321097Y." Felt tip notations to frame are as follows: "PTHO724" and "99028436." Power cord terminates in three-prong plug, which is marked: "Bausch & Lomb, P/N 334610-668, LR982-120…120V., 6.3VAC…50/60 HZ, 0.7 AMO, 6.5 W, Listed 792 E." In very good to fine condition.
