The HI735 Total Hardness Checker® (Low Range) is a compact, high-accuracy digital water hardness meter designed for fast and reliable measurement of total hardness from 0 to 350 ppm (mg/L) as CaCO₃. Manufactured by Hanna Instruments (Romania), this handheld checker replaces subjective visual test kits with precise digital results you can trust.
Using an EPA-recommended colorimetric method, the HI735 measures calcium and magnesium hardness via a red-violet reaction. It displays results instantly on a clear LCD—ideal for laboratory, industrial, environmental, and water treatment applications.
Key Features & Benefits
- Low-Range Total Hardness Measurement
Measures 0–350 ppm (mg/L) as CaCO₃, perfect for potable water and process monitoring. - High Resolution & Accuracy
- Resolution: 1 ppm (mg/L)
- Accuracy: ±6 ppm ±6% of reading @ 25°C
- Reliable Colorimetric Method
Based on EPA Method 130.1, ensuring standardized, repeatable results. - Advanced Optical System
- Light source: LED @ 470 nm
- Detector: Silicon photocell
- One-Button Operation
Simple workflow minimizes training time and operator error. - Portable & Battery Powered
Compact, lightweight design with auto-off after 10 minutes to conserve battery power.
Typical Applications
The HI735 Total Hardness Checker is widely used for:
- Drinking water quality testing
- Water treatment plants & RO systems
- Environmental monitoring
- Industrial process water
- Aquaculture & aquariums
- Laboratories, schools, and field testing
Technical Specifications
- Range: 0 to 350 ppm (mg/L) as CaCO₃
- Resolution: 1 ppm (mg/L)
- Accuracy: ±6 ppm ±6% of reading @ 25°C
- Method: EPA Method 130.1 (colorimetric)
- Light Source: LED @ 470 nm
- Detector: Silicon photocell
- Operating Environment: 0 to 50°C; max 95% RH (non-condensing)
- Battery: 1 × 1.5V AAA alkaline
- Auto-Off: After 10 minutes of non-use
- Dimensions: 86 × 61 × 37.5 mm
- Weight: 64 g
What’s Included (Starter Kit)
- HI735 Total Hardness Checker®
- Total Hardness Low Range reagents (2 tests)
- Sample cuvettes with caps (2)
- 1 mL graduated syringe with tip (2)
- Plastic refilling pipette (1)
- 1.5V AAA alkaline battery (1)
- Instruction manual
Why Buy from kommullo.com
- Authorized supplier of genuine analytical instruments
- Quality-checked products with proper documentation
- Competitive pricing for laboratories, utilities, and distributors
- Secure packaging and reliable delivery
- Professional pre- and post-sales technical support
The HI735 Total Hardness Checker® delivers laboratory-grade accuracy in a handheld format—making it a dependable, cost-effective solution for precise total hardness testing anywhere, anytime.
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