Hanna Total Hardness Checker (HI-735)
Accurate digital hardness testing for water quality control
The HI-735 Total Hardness Checker HC is специально designed to measure low levels of total hardness in water using a simple and reliable colorimetric method. It determines hardness as calcium carbonate (CaCO₃), providing consistent and precise results.
This handheld device offers a more accurate alternative to chemical test kits by removing subjective colour matching. Its single-button operation and large LCD display make testing quick, easy, and accessible for both professionals and beginners.
Why total hardness testing is important
Water hardness directly affects water quality and system performance:
- High hardness can cause scale buildup in pipes and equipment
- Low hardness may lead to corrosion
- Affects efficiency of heating and cooling systems
- Impacts water quality in food, agriculture, and industrial processes
Regular monitoring helps maintain optimal system performance and water balance.
Simple and reliable testing in four steps
The HI-735 is designed for fast and easy operation:
- Fill the cuvette with the water sample
- Add the reagent and mix gently
- Insert the cuvette into the checker
- Read the hardness value on the digital display
This straightforward process ensures accurate and repeatable results.
Ideal For
- Drinking water testing
- Process and industrial water
- Heating and cooling systems
- Swimming pools, spas, and hot tubs
- Agriculture and irrigation systems
- Food and beverage applications
What’s Included
- Hanna Total Hardness Checker HC (HI-735)
- Sample cuvettes with caps
- Starter reagent kit
- 1 x AAA battery
- Instruction manual
Optional Accessories:
- HI-735-25 Reagents (25 tests)
- HI-731321 Glass Cuvettes
- HI-731225 Cuvette Caps (pack of 4)
- HI-731318 Cuvette Cleaning Cloths
- HI-93703-50 Cuvette Cleaning Solution
Key Benefits
- Accurate digital measurement of total hardness
- No colour matching required
- Compact and portable handheld design
- Easy one-button operation
- Large, easy-to-read LCD display
- Auto shut-off to conserve battery
- Fast and reliable results
- Suitable for multiple water testing applications
Technical Specifications
- Product Code: HI-735
- Parameter: Total hardness (as CaCO₃)
- Method: Colorimetric method
- Design: Handheld colorimeter
- Display: LCD
- Operation: Single-button
- Battery: 1 x AAA
- Auto Shut-Off: Yes
Water Hardness Guide
| Hardness Classification | ppm (mg/L) | gpg (grains per gallon) |
|---|---|---|
| Very Soft | < 17.1 | < 1.0 |
| Soft | 17.1 – 60 | 1 – 3.5 |
| Moderately Hard | 61 – 120 | 3.5 – 7.0 |
| Hard | 120 – 180 | 7.0 – 10.5 |
| Very Hard | > 180 | > 10.5 |
*1 grain per gallon = 17.1 ppm
Important Notes
- Ensure cuvettes are clean and free from fingerprints
- Follow proper testing procedures for best accuracy
- Replace reagents regularly for reliable results
- Refer to safety data sheets when handling reagents
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