In use an index line is moved by turning a wheel until it coincides with the meter needle. The shutter speed / aperture pairs can then be read. The EV scale dates this example as being a later model.

One of two indices (black or red for low light) is aligned with the needle. The shutter speed / aperture pairs can be read. The price was £4.17.6. Accessory shoe fitting.

This was a popular post-war meter. The needle moves over a scale, the value given is transferred to the calculator and the shutter speed / aperture pairs can be read. The 1956 model incorporated a simple colour temperature meter. Five orange squares labelled 2600 - 10,000K and a comparison strip vary in apparent colour as the light changes the square most closely matching the comparison strip gives a a rough idea of the colour temperature.

This is a small meter to fit on a camera accessory shoe. A dial is turned until the meter needle indicates the aperture to use, a window then shows the shutter speed.

The meter cell is protected by two doors that open when the lid of the meter is raised. In use the meter needle moves over a scale, the number indicated is set on the calculator, the shutter speed / aperture pairs can then be read.

This fits into the accessory shoe of Leica M series cameras and couples with the shutter speed dial.