The RG40 reflex gauge provides a direct liquid-level reading without a separate illuminator, primarily for storage tanks and low-pressure vessels. Basic equipment includes heat-resistant pressure-vessel steel, selectable valve-connection orientation, DIN7081 borosilicate reflex glass, BSP G1/2 vent plug, A120-CS PN40 isolation valve in DN20 or DN25, and an AV250 drain valve.

Options include stainless steel, customised process connections, vent valve, alternative isolation/drain valves and an inclined arrangement.