The Hanna HI755 Checker is a handheld colorimeter designed to measure alkalinity in water with lab-grade accuracy in the field. This pocket-sized instrument eliminates guesswork and color-matching errors found in traditional test kits.
SPECIFICATIONS
Hanna HI755 Alkalinity Checker Technical Details
| Model Number | HI755 |
| Measurement Range | 0 to 300 mg/L (ppm) CaCO₃ |
| Resolution | 1 mg/L (ppm) |
| Accuracy | ±5 mg/L ±5% of reading at 25°C |
| Light Source | LED at 466 nm |
| Power Supply | 1 x AAA battery |
| Auto Shut-Off | After 3 minutes of non-use |
| Dimensions | 81.5 x 61 x 37.5 mm |
INSTALLATION & USE
How to Test Alkalinity with the HI755
- Fill the cuvette with 10 mL of your water sample to the line mark
- Insert the cuvette into the Hanna HI755 and press the button to zero the meter
- Remove the cuvette, add one packet of HI755-26 alkalinity reagent, and cap and shake for 10 seconds
- Reinsert the cuvette into the meter and press the button to display alkalinity reading in mg/L CaCO₃
COMPATIBILITY
Applications for the Hanna HI755 Checker
The HI755 is ideal for testing alkalinity in reverse osmosis feedwater, aquarium systems, hydroponics, pool and spa water, and drinking water quality monitoring. It requires HI755-26 reagent packets (sold separately) for each test. The colorimeter method provides repeatable results that are not subject to user interpretation of color charts, making it suitable for regulatory compliance testing and quality assurance programs where documentation is required.
🔧 Always wipe the outside of the cuvette with a lint-free cloth before inserting it into the HI755 to prevent false readings caused by fingerprints or water droplets on the glass.
