Total Hardness Photometer
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Better Features for Better Testing
Let your photometer guide you through setup, calibration, and testing with on-screen tutorials and animations so you always know the next step. Simply access Tutorial Mode at any stage in the setup or measurement process with the dedicated help key.
The auto-off feature prolongs battery life for peace-of-mind and energy savings if the meter is accidentally left on.
When the battery level is below 10%, a warning symbol will blink to indicate low battery condition. When low battery power may affect your results, the meter will shut down to avoid erroneous readings caused by low battery level.
Data Logging
Missed a measurement? No need to worry because your photometer will automatically log the last 50 measurements. The results can be viewed instantly using the Log Recall Menu.
CAL CheckTM Validation
Hanna’s exclusive CAL CheckTM feature provides a stress-free, straightforward way to ensure your photometer is working properly. Simply insert the certified CAL CheckTM standards and let your meter guide you through validation. If your photometer is out of specification for any reason, simply calibrate to your standard.
Advanced Optical System
A Light Emitting Diode (LED) provides more light while using less power and a narrow band interference filter results in more accurate and repeatable readings.
Built Better
Designed to withstand the knocks, drops, and spills of real life, the new IP67 body ensures top performance in any environment. Internal optics are sealed from outside dust, dirt, and water. In addition, it floats, just in case you drop your meter in water. This photometer uses an exclusive positive‑locking system to ensure that the cuvettes are placed into the holder in the same position for accurate readings every time.
Portable Design
Made to fit comfortably in your hand for on-the-go testing or sit on a table for benchtop use, a backlit LCD display provides at-a-glance readings from any angle, day or night. The supplied AA batteries provide life for more than 800 measurements.
We believe that buying a meter should be simple. Your HI97735 photometer has many of the necessary accessories needed for successful measurements.
Each HI97735 is supplied with:
- Sample cuvette (2 pcs.)
- Sample cap (2 pcs.)
- Plastic stopper (2 pcs.)
- Alkaline batteries: 1.5V AA (3 pcs.)
- Instruction manual
- Meter quality certificate
Upgrade to the Total Hardness Photometer Kit (includes the CAL CheckTM Standards) for the most economical option for testing.
Each HI97735C is supplied with:
- Sample cuvette (2 pcs.)
- Sample cap (2 pcs.)
- Plastic stopper (2 pcs.)
- A ZERO ‑ CAL CheckTM Cuvette A
- HI97735B - CAL CheckTM Cuvette B for Total Hardness LR, MR, HR
- Cloth for wiping cuvettes
- Scissors
- Alkaline batteries: 1.5V AA (3 pcs.)
- Instruction manual
- Meter quality certificate
- CAL CheckTM standard certificate
Resources
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Specifications
Specification Name Detail sku HI97735 Hardness, Total Range Hardness LR: 0 to 250 mg/L; Hardness MR: 200 to 500 mg/L; Hardness HR: 400 to 750 mg/L (ppm) Hardness, Total Resolution 1 mg/L from 0 to 750 mg/L (ppm) Hardness, Total Accuracy Hardness LR: ±5 mg/L ±4% of reading; Hardness MR: ±7 mg/L ±3% of reading; Hardness HR: ±10 mg/L ±2% of reading Hardness, Total Method adaptation of the EPA recommended method 130.1 Light Source light emitting diode Light Detector silicon photocell Bandpass Filter Bandwidth 8 nm Bandpass Filter Wavelength Accuracy ±1.0 nm Logging 50 readings (auto logging) Auto-off After 15 minutes of inactivity (30 minutes before a READ measurement) Environment 0 to 50 °C (32 to 122 °F); 0 to 100% RH, non‑serviceable Dimensions 142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0") Weight 380 g (13.4 oz.) Warranty 2 years - Product Manuals
