Our Ozone portable photometer (HI97757) is an auto-diagnostic Ozone portable photometer that benefits from Hanna’s® years of experience as a manufacturer of analytical instruments. It has an advanced optical system that uses a Light Emitting Diode (LED) and a narrow band interference filter that allows for accurate and repeatable readings.
Ozone is a widely used disinfectant in the treatment of drinking water, wastewater and swimming pools.
*Products classified as Dangerous Goods can only be shipped via ground.
The optical system is sealed from outside dust, dirt and water. The meter uses an exclusive positive-locking system to ensure that the cuvettes are placed into the holder in the same position every time.
With the CAL Check™ functionality, users are able to validate the performance of the instrument at any time and apply a user calibration (if necessary). Hanna Instruments® CAL Check cuvettes are made with NIST traceable standards.
The built-in tutorial mode guides users step-by-step through the measurement process. It includes all steps required for sample preparation, the required reagents and quantities.
Our Ozone portable photometer meter measures ozone in water samples from 0.00 to 2.00 mg/L (ppm). The method is the DPD Colorimetric Method.

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.
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.
Hanna's exclusive CAL Check feature provides a stress-free, straightforward way to ensure your photometer is working properly. Simply insert the certified CAL Check standards and let your meter guide you through validation. If your photometer is out of specification for any reason, simply calibrate to your standard.

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.
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.
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.
Each HI97757 is delivered in a cardboard box and is supplied with:
Each HI97757C is delivered in a rugged carrying case and is supplied with:
| Specification | Detail |
|---|---|
| Ozone Range | 0.00 to 2.00 mg/L (as O3) |
| Ozone Resolution | 0.01 mg/L |
| Ozone Resolution | ±0.02 mg/L ±3% of reading at 25 °C |
| Method | DPD Colorimetric Method |
| Light source | Light Emitting Diode |
| Bandpass filter | 525 nm |
| Bandpass filter bandwidth | 8 nm |
| Bandpass filter wavelength accuracy | ±1.0 nm |
| Light detector | Silicon photocell |
| Cuvette type | Round 24.6 mm diameter (22 mm inside) |
| Auto logging | 50 readings |
| Display | 128×64 pixel B/W LCD with backlight |
| Auto-off | After 15 minutes of inactivity (30 minutes before a Read measurement) |
| Battery type | 1.5 V AA Alkaline (3 pcs.) |
| Battery life | >800 measurements (without backlight) |
| Environment | 0 to 50 °C (32 to 122 °F); 0 to 100% RH, non-serviceable |
| Dimensions | 142.5×102.5×50.5 mm (5.6×4.0×2.0") |
| Weight (with batteries) | 380 g (13.4 oz.) |
| Case ingress protection rating | IP67, floating case |