The Hanna Instruments HI 705 is a hand-held colorimeter for testing low ranges of silica. It is designed as an accurate alternative to chemical test kits.
The Hanna Instruments HI 707 is a hand-held colorimeter for testing low ranges of nitrites. It is designed as an accurate alternative to chemical test kits.
The Hanna Instruments HI 708 is a hand-held colorimeter for testing high ranges of nitrites. It is designed as an accurate alternative to chemical test kits.