Hanna HI701 Free Chlorine Checker HC

Hanna HI701 Free Chlorine Checker HC – Portable Digital Colorimeter for Chlorine Monitoring

The Hanna HI701 Free Chlorine Checker HC is a compact, palm-sized digital colorimeter designed to measure free chlorine levels quickly and accurately in water. Chlorine is the most widely used disinfectant in residential and commercial water systems, and routine monitoring is essential to ensure safe water quality in swimming pools, spas, aquariums, and other aquatic systems. This handheld device simplifies water testing by combining the accuracy of a laboratory instrument with the convenience of a digital tester, making it ideal for on-site use.

Unlike test strips or visual color matching, the Checker HC uses a built-in LED light source and silicon photocell to provide consistent, easy-to-read results on a digital display. The unit features automatic shut-off, easy reagent handling, and simple one-button operation. It comes ready-to-use with reagents for 6 initial tests, and refill packs (HI-701-25) are available for extended use.

Product Features

• Laboratory Accuracy in Your Hand
  Provides precise digital readings with ±3% accuracy and 0.01 ppm resolution—no guesswork involved.

• Palm-Sized and Lightweight
  Weighing only 64 grams and sized to fit comfortably in your hand or tool kit, making it perfect for on-site water testing.

• One-Button Operation
  Simple interface with one button to start and complete tests, ideal for non-technical users.

• Large Digital Display
  Easy-to-read LCD for quick, clear readings—no visual comparison needed.

• Auto Shut-Off Feature
  Conserves battery life by powering off automatically after 2 minutes of inactivity.

• Standard USEPA Method
  Based on the EPA 330.5 method, using DPD reagent that develops a pink color in the presence of free chlorine.

• Starter Reagents Included
  Comes with reagents for 6 tests; compatible with HI-701-25 refill reagent pack (25 tests).

Applications

The HI701 Free Chlorine Checker is ideal for a wide range of environments and users who require fast, accurate chlorine monitoring:

• Swimming Pools and Spas
  Maintains safe chlorine levels to protect users from harmful bacteria and ensure proper water sanitation.

• Aquariums and Fish Tanks
  Ensures chlorine levels are kept within safe limits for aquatic life. Ideal for routine monitoring and water changes.

• Water Treatment and Disinfection Verification
  Confirms effective chlorination in residential, commercial, and field applications.

• Education and Laboratory Use
  Simplified chlorine testing for students and technicians in training or instructional environments.

Technical Specifications

• Measurement Range: 0.00 to 2.50 ppm (mg/L)

• Resolution: 0.01 ppm (mg/L)

• Accuracy: ±3% of reading ±0.03 ppm @ 25°C

• Light Source: LED @ 525 nm

• Light Detector: Silicon photocell

• Method: Adaptation of USEPA method 330.5 using DPD reagent

• Auto-Off: After 2 minutes of inactivity or after displaying result

• Battery: One 1.5V AAA battery

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

• Operating Humidity: Max 95% RH (non-condensing)

• Dimensions: 81.5 × 61 × 37.5 mm

• Weight: 64 g

Important Notes

• Interferences: Bromine, iodine, ozone, and oxidized forms of chromium and manganese may affect results.

• Hard Water: For water hardness >500 mg/L CaCO₃, shake the sample for 2 minutes after adding reagent.

• Alkalinity and Acidity: High alkalinity (>250 mg/L CaCO₃) or acidity (>150 mg/L CaCO₃) may affect color development. Use diluted HCl or NaOH to neutralize the sample if needed.