Welch Allyn GS 777 Wall Unit Coaxial Ophthalmoscope & Diagnostic Otoscope with an Aneroid Sphygmomanometer Body Composition Monitors Clinically tested Accuracy has Clinically tested Accuracy has been clinically tested according to the protocol of the BHS with the highest possible grade of A A The smooth surfaces of the lamp head allow for easy disinfection 2 filters can be used in conjunction with any of the above apertures:Red FreeRed Free filter filters out red light for easy identification of veins Green Series™ 777 Wall TransformerHelp reduce facility cost with a more energy efficient productHelp reduce risk of cross contamination by reducing contact with no on off switchHelp improve work flow with contoured handles that automatically turn on offQuickly and easily upgrade from the Welch Allyn 767 Wall Transformer to the GS 777 Wall Transformer11720 Coaxial OphthalmoscopeHalogen light for true tissue colour and consistent