The HydroTest Pro HT3000 is a modern, portable single-beam spectrophotometer that has been specifically designed for water testing. The powerful yet cost-effective instrument is housed in a waterproof carry case, with battery power supply (mains optional), offering a truly portable spectrophotometer, optimised for field applications. Spectral data is displayed on the screen graphically, as well as a list of maximum and minimum absorption levels. The single beam spectral photometer has no need for a warm-up period, speeding up obtaining results on site. The automatic self-test and wavelength adjustment system ensures accuracy throughout the lifetime of the halogen lamp. The spectrophotometer can also be tested using a NIST-traceable secondary standard filter set.