Hanna Instruments Marine Calcium Checker - Easier to use and more accurate than chemical test kits. Check your saltwater reef aquarium calcium levels with ease.

Dual Digital Timer Hamilton - Hamilton Technology Dual Digital Aquarium Timer has two inputs and features a LCD digital clock and readout.

The Apogee Quantum Meter (model MQ-200) is ideally suited for use in aquariums. The sensor head is potted solid and completely sealed. There is no hollow cavity for water to eventually penetrate and cause measurement errors. The blue lens improves the spectral response to more accurately measure all wavelengths of light...