Hanna HI735 Total Hardness Low Range Checker

Hanna HI735 Total Hardness Low Range Checker HC

The Hanna HI735 Total Hardness Low Range Checker HC is a compact, handheld colorimeter designed to deliver precise measurements of total water hardness in the low range, expressed as calcium carbonate (CaCO₃). This device is ideal for users who need quick and accurate results in home water testing, aquaculture, environmental monitoring, or educational settings.

Unlike traditional chemical test kits that rely on color matching and are prone to human error, the HI735 provides digital accuracy and a user-friendly experience. It uses a simple colorimetric method in which calcium and magnesium react with the reagents to produce a red-violet tint—quantified by the device’s internal optical system.

Key Features

• Low Range Measurement: Measures total hardness from 0 to 350 ppm as CaCO₃, making it ideal for soft to moderately hard water analysis.

• Compact & Portable: Palm-sized and lightweight, perfect for use in both the field and laboratory.

• Digital Precision: Offers accurate and repeatable results with a resolution of 1 ppm.

• Simple Operation: Operates with a single button for easy testing in four simple steps.

• Auto Power-Off: Automatically shuts off after 10 minutes of inactivity to conserve battery life.

• Battery Powered: Uses a standard AAA battery for maximum portability and convenience.

Typical Applications

• Drinking Water Quality Testing

• Aquaculture & Aquarium Maintenance

• Boiler and Cooling Water Monitoring

• Environmental and Field Research

• Education and Laboratory Use

Technical Specifications

• Measurement Range: 0 to 350 ppm (mg/L) as CaCO₃

• Resolution: 1 ppm

• Accuracy: ±6 ppm ±6% of reading @ 25°C

• Method: Adaptation of EPA Method 130.1 – Reaction forms red-violet tint with calcium and magnesium

• Light Source: LED @ 470 nm

• Light Detector: Silicon photocell

• Operating Temperature: 0 to 50°C (32 to 122°F)

• Humidity Range: Up to 95% RH non-condensing

• Battery Type: 1.5V AAA alkaline battery

• Auto-Off: After 10 minutes of non-use

• Dimensions: 86.0 x 61.0 x 37.5 mm

• Weight: 64 g