... 56x34x32cm3/ctn, 20pcs/ctn, 17.5/16kgs Purpose: ENT diagnostic set is designed for doctor's medical check eyes,ears,nose ... lenses are polished with refined high quality optical glasses.Optical prism projects clear image on eye bottom due to its umique ... ) Power Supply:1.5V x 2 "C"Type ENT Diagnostic Set WG-I