Cliplight Manufacturing's Vision (No. 309) and Firefly (No. 310) introduce sight glasses to refrigeration manifold gauge sets. The patent-pending Vision's manifold makes refrigerant/oil inspection quick and easy with a deep-well see-through sight glass that uses ambient light. The patent-pending Firefly combines a built-in 2-times magnifying sight glass with both white or blue LED backlighting to illuminate refrigerant, contaminants and whether the system has UV dye. The back-light increases refrigerant visibility by 75 percent when combined with the magnification feature. Both are available in blow-molded storage cases with 72" charging hoses, Nos. 309KIT and 310KIT.