The Tempophot was introduced in 1935, an improved model, named Tempiphot, was brought out the following year. That model was more sensitive and had provision for a plug-in amplification cell. A little later the T30/100 model Tempiphot was introduced, again being more sensitive.

The film speed is set on a scale around the calculator index which is carried on a small sector. As the reading is taken the required shutter speed is aligned with the needle by moving the sector, the index will then show the aperture to be used. A baffle swivels in front of the cell for readings in bright light.

In use the reading is taken which gives the light value, this is set against the film speed, the range of shutter speed / aperture pairs can be read. the price was £2.17.6. German.