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 and aperture pairs can be read. The price was £2.17.6. German.

In use the reading is taken which gives the light value, this is set against the film speed, the range of shutter speed and aperture pairs can be read.

In use the reading is taken which gives the light value, this is set against the film speed, the range of shutter speed and aperture pairs can be read. The meter is marked with Bing's patents: GB348662 and US1864180. German for the American market.

The meter cell is lowered into place by pressing a button on the side of the meter, the meter needle moves over a scale of values, a plate on the top of the meter showing film speed values is then moved so that the film speed aligns with the light value. The shutter speed and aperture pairs can then be read. Also produced showing continental stops.