Abstract
No evidence has been found to support the belief that the halide meter operates on the copper or copper-halide excitation principle. Rather, it is a more subtle mechanism, involving enhancement of the nitrogen band spectra in the presence of a halogen. The electrode material used serves only to conduct electric current. A stainless-steel and platinum electrode system along with an ultraviolet transmitting filter has been proposed which increases the sensitivity fourfold and the longevity of calibration by 50 to 100 times.