Hanna Instruments HI-735-25 Reagents for HI-735 Total Hardness Low Range Checker HC
The HI-735-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Total Hardness LR Checker® HC.
Uses the USEPA 130.1 adaptation to determine Low Range Total Hardness. These high-quality reagents are clearly marked with the lot number and expiry date on each packet for traceability. The results will be display in ppm as CaCO3
Tips for an accurate measurement
It is important that the sample does not contain any debris. Whenever the cuvette is placed into the measurement cell, it must be dry outside and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI-731318 or a lint free cloth prior to insertion.
Shaking the cuvette can generate bubbles, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.
Do not let the reacted sample stand for too long after the reagent is added or accuracy will be lost.
After the readings, it is important to discard the sample immediately, otherwise the glass might become permanently stained.
Four steps. One click. Instant Readout
1. ‘Zero’ the Checker®HC with your vial inside
2. Place a 10ml water sample into the vial and add your reagent
3. Place your vial into your Checker®HC
4. Press the button and read the results
Use HI-735-11 Calibration Check Set with the HI-735.
Specifications
| Accessories | |
|---|---|
| HI-731318 | cuvette cleaning cloth x 4 |
| HI-731315 | Glass cuvettes and caps x 2 |
| HI-731321 | Glass cuvette x 4 |
| HI-731225 | Cuvette cap for Checker®HC x 4 |
| HI-93703-50 | Cuvette cleaning solution |
| HI-740226 | 5mL graduated Syringe |
| HI-740157P | Plastic refilling pipette x 20 |
| HI-740144P | Pipette tip x 10 |
| HI-740143 | 1mL graduated syringe x 6 |
| HI-740036P | 100mL plastic beaker x 10 |
| HI-70436M | deionised water (230mL) |
| HI-70436 | deionised water (1G) |
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.