Scale range:1.35-1.85.Accuracy: ≦±0.003 CZ Gem Refractometer

★Hard CZ measuring prism. ★Scale range:1.35-1.85.Accuracy: ≦±0.003 ★Professional optical design, Aluminum alloy table and Internally installed the monochromatic light. ★There are two ways of inputing the voltage:7﹟batteries and DC3V direct current suply(AC100—240V). ★2ml refringent oil(1.78±0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7), ★It is much safer ,much ecnomical and more convinent.