Hanna HI735-11 – Total Hardness Low Range Checker HC
The Hanna HI735-11 Total Hardness Low Range Checker HC is a compact, digital colorimeter designed for quick and accurate measurement of water hardness in ppm (mg/L) as CaCO₃. Unlike traditional test kits that rely on subjective color matching, this handheld device delivers precise digital readings using a colorimetric method. As a result, users can enjoy both reliability and simplicity in a portable tool built for field and lab use.
Key Features
The HI735-11 measures total hardness in the range of 0 to 350 ppm, with a resolution of 1 ppm and an accuracy of ±6 ppm ±6% of reading at 25°C. This makes it highly suitable for soft to moderately hard water analysis.
EPA-Recommended Testing Method
The device uses an adaptation of EPA Method 130.1, where calcium and magnesium react with reagents to produce a red-violet tint. The instrument detects this tint and calculates the hardness digitally.Fast and Simple Operation
With its one-button interface and clear LCD display, users can perform hardness testing in just a few easy steps—no guesswork involved.Portable and Field-Friendly
In addition, the small size and lightweight build allow for convenient testing in remote locations or on-site water systems.Energy Efficient
To preserve battery life, the Checker HC automatically powers off after 10 minutes of inactivity.
Technical Specifications
| Specification | Details |
|---|---|
| Measurement Range | 0 to 350 ppm (mg/L) as CaCO₃ |
| Resolution | 1 ppm |
| Accuracy @ 25°C | ±6 ppm ±6% of reading |
| Light Source | LED @ 470 nm |
| Light Detector | Silicon photocell |
| Method | Colorimetric, EPA Method 130.1 adaptation |
| Reaction Color | Red-violet tint |
| Battery Type | One 1.5V AAA alkaline battery |
| Auto-Off Function | After 10 minutes of non-use |
| Operating Environment | 0 to 50°C (32 to 122°F); up to 95% RH, non-condensing |
| Dimensions | 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5 inches) |
| Weight | 64 g (2.3 oz) |
Applications
Drinking Water Monitoring
Easily assess water hardness to ensure quality and scale prevention in domestic or municipal systems.Boiler and Cooling System Maintenance
Additionally, use this device to help manage hardness levels that could impact equipment efficiency or longevity.Environmental Field Testing
Researchers and technicians frequently rely on the HI735-11 to monitor natural water sources and groundwater hardness levels.Aquariums and Aquaculture
Furthermore, maintaining the right hardness level is crucial for aquatic species and overall water stability.
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