The Autochrome and later Colour Plate meters had dials interchangeable with the Bee. The inner dial (on the glass) had different calibrations compared to the Bee, the required exposure was found by Watkins not to be inversely proportional to the intensity of the light as registered on the sensitive paper e.g. a decrease of light of 64 times required 128 times increase in exposure. In 1913 the Autochrome Meter was replaced by the Colour Plate model.

In 1913 the Colour Plate Meter replaced the Autochrome model.

This is similar to the previous entry.

This is similar to the previous entry but has a blue glass.

The Indoor version of the Bee has a 1/16 tint on a dial interchangeable with the ordinary model Bee. The 1/16 tint was available before 1910 but from that date it was sold under the name of Indoor. Illustrations of early models show the aperture scale extended to f45 and the actinometer scale extended to 130. Also available with US stop markings.

This, early example, has a dial printed in a flowing script, apertures to f45 and an actinometer scale to 130. The instruction book notes that there are price rises for additional dials from 6d to 7d, disc refills have risen from 6d to 7d and speed cards are now 1 ½d rather than 1d.

Similar to the previous entry but with apertures to f40 and an actinometer scale to 90. The dial is printed in a block script.

Similar to the previous entry but the dial includes faster apertures.

The Studio meter had dials interchangeable with the Bee. It was intended for indoor use and had a ¼ comparison tint which was lighter than the standard tint. For indoor use Watkins recommended exposing the meter and the plate in the camera at the same time. When the tint was reached the lens cap was replaced or the shutter closed. Prior to the introduction of the Studio meter ¼ tints were available to replace the standard (whole) tint of the regular Bee. These were on a dial having a modified calibration. Prior to 1910 the regular model Bee had a ¼ tint as well as a whole tint.

This meter is for use with simple cameras having fixed apertures and speeds. It does not give the exposure required but indicates whether the light is good enough to make an exposure. In use the meter is exposed for a set time. If after that time the sensitive paper had darkened to approximately the same tint as the comparison tint an exposure could be made. The fixed time was 4s for a box camera and other times for cameras with better lenses. Price 1/6.