Hanna Total Hardness Low Range Checker HC – HI-735
| Brand | |
|---|---|
| Model | HI-735 |
| Range | 0–350 mg/l (ppm) as CaCO₃ |
| Resolution | 1 mg/l |
| Accuracy | ±6 mg/l ±6% of reading at 25°C |
| Method | Calcium-and-magnesium colour reaction; adaptation of EPA Method 130.1 |
HI735 measures total hardness, reported as mg/l of calcium carbonate equivalent. It gives a digital result over 0–350 mg/l for a prepared sample, rather than asking you to match the final colour by eye.
£102.82 (inc VAT)
Hanna HI735 Total Hardness Checker
Check the parameter and range first
HI735 measures total hardness, reported as mg/l of calcium carbonate equivalent. It gives a digital result over 0–350 mg/l for a prepared sample, rather than asking you to match the final colour by eye.
This is total hardness from calcium and magnesium, commonly discussed as GH in pond care. It is separate from alkalinity or KH, which concerns buffering. Record the unit as well as the number; mg/l as CaCO₃ and degrees of hardness are different ways of expressing a result.
| Specification | Details |
|---|---|
| Model | HI735 |
| Measuring range | 0–350 mg/l (ppm) as CaCO₃ |
| Resolution | 1 mg/l |
| Accuracy | ±6 mg/l ±6% of reading at 25°C |
| Method | Calcium-and-magnesium colour reaction; adaptation of EPA Method 130.1 |
Preparing the sample
Follow the HI735 method’s measured additions and preparation steps. The supplied syringes and pipette are part of the procedure; a single generic instruction to add any hardness powder to 10 ml of pond water is not enough.
Keep the cuvette outside clean and dry, check for bubbles and use the alignment and handling instructions for this model. A digital display removes the colour-chart comparison; careful sampling and reagent handling still matter.
What is included?
The HI735 pack includes two sample cuvettes with caps, total-hardness starter reagent set, two 1 mL syringes with tips, plastic refilling pipette, one AAA battery and instructions.
Reagents, checks and replacement cuvettes
Use HI735-25 replacement reagents for this Checker, following the test count and storage information on the current pack. The HI735-11 reference set checks the instrument response; it is separate from the reagents that react with a fresh water sample. Follow the reference-set instructions rather than treating it as a user calibration adjustment.
Our HI731315 Checker HC cuvettes with caps are a replacement option for this handheld Checker family. They are distinct from the larger photometer cuvettes and caps used by other Hanna ranges.
Our guide to water hardness and pH stability explains why a GH result and a KH result answer different questions.
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