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Hanna Instruments Canada
Customer Support: (800) 842-6629

Total Hardness EPA Portable Photometer - HI96735

The HI96735 is no longer available.

Below is the link to a new meter that has been upgraded with many advanced features including an improved optical system, dot matrix LCD that offers a graphical tutorial mode to help the user through the measurement process and is waterproof including the cuvette assembly.

Both meters use the same reagents.

view new meter


The HI96735 portable photometer is for the measurement of total hardness. Hanna’s portable photometers feature an advanced optical system; the combination of a light emitting diode (LED), a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.

Features at-a-glance

*Reagents ordered separately

cal check standards

CAL Check™ standards with certificate

The HI96735-11 CAL Check™ standards are used for calibration and performance verification of photometers with the CAL Check™ function.

Supplied with Certificate of Analysis

  • Lot number
  • Expiration date
  • Standard value @ 25 ℃
  • Reference meter NIST traceable

Provided storage containers

  • Light tight
  • Protects from accidental breakage
photometer steps

Additional information

Weight 0.08 kg



SKU HI96735-web
Name Total Hardness EPA Portable Photometer – HI96735
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) CaCO₃
Hardness, Total Resolution 1 mg/L from 0 to 100 mg/L, 5 mg/L from 100 to 750 mg/L (ppm) CaCO₃
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
Photometer/Colorimeter Light Source light emitting diode
Photometer/Colorimeter Light Detector silicon photocell with narrow band interference filter @ 466 nm
Battery Type/Life 9V battery
Automatic Shut-Off after ten minutes of non-use in measurement mode; after one hour of non-use in calibration mode; with last reading reminder
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Weight 9V battery
Dimensions 193 x 104 x 69 mm (7.6 x 4.1 x 2.7”)

Ordering Info

HI96735 is supplied with sample cuvettes (2) with caps, 9V battery, instrument quality certificate and instruction manual. *CAL Check™ standards and testing reagents sold separately.


Total Hardness EPA Portable Photometer – HI96735