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 HI 764 Checker®HC bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate ...

HI 721 Iron Colorimeters Starting Range: 0.00 to 5.00 ppm(mg/L)

The Hanna Instruments HI 775 is a hand-held colorimeter for testing alkalinity in fresh water. It is designed as an accurate alternative to chemical test kits.

HI 755 Checker®HC Handheld Colorimeter - Alkalinity

HI 718 Iodine Colorimeters Starting Range: 0.00 to 12.5 ppm(mg/L)

HI 723 Chromium VI Colorimeter Starting Range 0 to 999 ppb.