Reflex camera is a type of camera that uses a movable mirror placed between the lens and the film to project the image seen through the lens to a matte-focusing screen. It uses a roof pentaprism or pentamirror to observe the image via an eyepiece, but there are also other finder arrangements, such as the waist-level finder or porro prism. Any camera using a mirror between the lens and a focussing screen. Allows the image to be seen and composed right way up.

Reflex Level Gauge is an instrument, which consists of a metal body, machined to have an internal chamber and one or more front windows. Reflex level gauges working principle is based on the light refraction and reflection laws. Reflex level gauges use glasses, in which the face fitted towards the chamber shaped to have prismatic grooves with section angle of 90°.

Reflow soldering is defined as joining of mating surfaces that have been tinned and/or have solder between them, placing them together, heating them until the solder fuses, and allowing them to cool in the joined position. Thus reflow processes are characterized by a separate application of the solder and the heat used to melt, or reflow, the solder. Techniques for applying solder onto component and/or board metallizations include dipping, electroplating, solder performs and solder paste.

Reflow Soldering Machines use pneumatic force control to replace spring technology. Its force is set by manual knob and set range is displayed by digital screen on head. Typical joining applications include flex to PCB, wires to PCB, ribbon cables and SMT components.

Reflux Valves are used in pipelines to reduce water hammer and to prevent back flow of water to the pumps from rising mains. These valves are suitable for handling clear water having turbidity of 3000 ppm maximum within the limits of the working pressure mentioned overleaf suitable for temperature up to 50oC.

Reforming catalyst consists of small amount of platinum and cadmium and chloride on an alumina support. Preferably the cadmium is in the amount of about 0.2% wt. Shift catalysts include conventional base metal high (FeCr) and low-temperature (CuZn) compositions. These catalysts are available as tablets or extrudates.