The Blendux was for cine use, the Ombrux, was for still photography. The Blendux is simple to use, a needle indicates the aperture required for a set film speed and f.p.s. value (16 f.p.s. with a shutter speed of 1/32). Tables are used for other films, shutter speeds and f.p.s. The price was £4.4.0. The Ombrux is similar to the cine version, a needle moves over a dial and shows the shutter speed for a set aperture and film speed, tables are consulted for other film speeds and apertures. The meters are dual range, pressing a button on the face of the meter activates the more sensitive scale.

The Cimbrux was for cine use, similar to the Blendux.

The needle moves over a scale of shutter speeds that is connected to an aperture scale. In use the reading is taken and as the needle moves across the shutter speed scale the aperture ring can be turned to bring the required setting into a window. Alternatively the aperture is set first and the shutter speed is read when taking the reading. The price was £5.5.0.

The needle moves over a scale of shutter speeds. A quadrant-shaped plate carries the aperture scale and an index, this is rotated to align the index with the needle, the shutter speed and aperture pairs can then be read. The plate carrying the aperture scale has a window showing film speeds, setting a film speed in the window moves the index relative to the aperture scale. The layout is interesting, the needle is pivoted near the bottom right corner of the meter, the index plate is pivoted at the opposite corner, the shutter speed dial is concentric with the index plate. Once the film speed is set on the index plate only a single movement is needed to read the full set of shutter speed and aperture pairs, but at the extremes of the shutter speed scale the needle is at a near tangent to the scale.

The meter was first produced in 1939 and with few changes it was re-introduced in 1954. Pre-war models had a flap covering the meter cell and dial. The meter shown in the Westminster catalogue of 1939 named the Grand-Prix has the letters RES on the cover. A very similar meter was sold in Britain as the Chum.