SIMBAD references

Uniformity of instrumentation is a vital requirement for the success of the WET network. We report here on the photometer adopted in the previous WET conference as the standard WET photometer. In particular, we describe a recent addition to the design which allows the previously two-channel instruments to be converted to three-channel instruments, the third channel constantly measuring the sky background. This new component is a bolt-on upgrade to the existing two-channel photometers used by the WET and many others around the world. We will make the complete design (including acquisition and reduction software) available to interested parties upon request