Hanna Instruments

Scientific Equipment

HI-96735 Total Hardness Portable Photometer

HI-96735 Total Hardness Portable Photometer

Hanna HI-96735 Total Hardness Portable Photometer

HI-96735 Total Hardness Portable Photometer

Complete with cuvettes
2 year manufacturer warranty
In Stock
£274.50 (exc. VAT) £329.40 (inc. VAT)

The HI-96735 measures the total hardness in drinking, surface and wastewater.

Water Resistant – Can withstand temporary exposure to water, but should not be submerged or washed under running water.
Battery powered – Allows use away from a power source. Batteries are included with all battery operated products.

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HI-96735 Total Hardness Portable Photometer information

Hanna's extended description

Total Hardness Portable Photometer

The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same position every time it is placed into the measurement cell. It is designed to fit cuvettes with a larger neck making it easier to add both sample and reagents. The cuvettes are made from special optical glass to obtain best results.

Total hardness, that is the presence of magnesium and calcium, is due mainly to the runoff water dissolving these salts as it flows or filters through different strata. Hardness can also cause scaling of pipes in cooling and heating systems.

Key features

  • Clear display messages make the instrument quick and easy to operate
  • The powerful Cal Check calibration function means that there is no need to return the instrument to the laboratory to check its efficiency. Samples can be checked and validation confirmed at the press of a button
  • Positive locking system ensures the cuvette is located in the same position each and every time is it placed in the measurement cell
  • Auto shut off feature turns meter off after 10 minutes of non-use to save battery life
  • Fully water resistant
  • Clear easy to use function buttons
  • Direct readout of parameter measured

Designed for precision

With the Hanna calibration check validation function, users can verify the performance of the meter quickly and easily at any time. Using Hanna NIST traceable standards, it takes just a few moments to check the accuracy of the instrument and to recalibrate as and when necessary.

All new instruments are factory calibrated at source and the electronic and optical design of the Hanna photometers minimises the need for frequent calibration. The Hanna calibration check further minimises the frequency with which instruments need to be returned to the calibration laboratory for full servicing.

Order information

  • Meter only (HI -96735): 2 glass cuvettes, 9V battery

NB: reagents ordered separately.


Specifications list


Range Total hardness LR: 0 to 250 mg/L (ppm); MR: 200 to 500mg/L (ppm); HR: 400 to 750mg/L (ppm)
Resolution Total Hardness LR: 1 mg/L from 0 to 100 mg/L, 5mg/L from 100 to 250 mg/L
Total Hardness MR: 1 mg/L from 0 to 100 mg/L, 5mg/L from 100 to 500 mg/L
Total Hardness HR: 5mg/L from 400 to 750 mg/L
Precision LR: ±5 mg/L or ±4% of reading
MR: ±7 mg/L or ±3% of reading
HR: ±10 mg/L or ±2% of reading
Light Source Tungsten lamp
Light Detector Silicon photocell with narrow band interference filter @ 466
Method adaptation of the EPA recommended method 130.1
Ordering Information HI-96735 is supplied with sample cuvettes (2) with caps, 9V battery, instrument quality certificate and instruction manual.
Reagents and Standards (sold separately) HI-96735-11 CAL CheckTM standard cuvettes; HI-93735-00 Reagent for 100 tests (0 -250mg/L); HI-93735-01 Reagent for 100 tests (200-500mg/L); HI-93735-02 Reagent for 100 tests (400 -750mg/L); HI-93735-0 Reagent for 100 tests (0 -750mg/L)
PLEASE NOTE: In some cases, samples may contain other parameters which may interfere with results
Interference may be caused by: Excessive amounts of heavy metals.
Note: If the sample is very acidic, some extra drops of HI 93735B-0 buffer reagent may be added.

Downloadable Manuals


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Product Literature

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Hanna Instruments Literature

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