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https://www.swelluk.com:443/hanna-chlorine-pocket-checker/ 
Hanna Chlorine Pocket Checker
Ensure your aquarium is in great condition with a helping hand from a Hanna Checker. The Hanna Checker bridges the gap between simple chemical test kits and professional instrumentation. Hanna Checkers are small, handheld photometers that provide higher result accuracy than typical chemical test kits.
Product Information
Ideal for marine or saltwater aquariums. Chlorine is the most common water disinfectant and by monitoring chlorine regularly and accurately, serious health and safety risks can be avoided.Controlling chlorine levels in fish tanks will help optimise fish and plant health. These Hanna Pocket checkers have improved digital technology in a compact design, taking measurements is now even quicker and hassle-free. The Checker is supplied with reagents for 6 tests, use alongside recommended dechlorinators.
Key Features:
- 0.00 to 2.50 ppm range
- Quick and easy testing
- Single-button operation
- High precision results - more accurate than chemical test kits
- Clear to read large Liquid Crystal Display screen (LCD)
- Fully portable, fitting easily into both palm and pocket
- Auto shut-off feature
Product Contains:
- Supplied with 2 sample cuvettes and caps
- Starter pack of reagents (replacements will be needed)
- 1 x 1.5 AAA battery supplied
- Instructions