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https://www.swelluk.com:443/hanna-phosphate-ultra-low-pocket-checker/ 
Hanna Phosphate Ultra Low Pocket Checker
Ensure your marine life & aquariums are 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
The Ultra Low Range Phosphate Checker (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure phosphate from 0.00 to 0.90 ppm.
Phosphate is an important parameter to measure in aquaculture and aquariums. Levels that are too high can lead to extensive algae growth, depleted dissolved oxygen levels, and ultimately can be fatal to many types of fish and aquatic life.
Designed as a more accurate alternative to chemical test kits.
Key Features:
- Measures phosphate from 0.00 to 0.90 ppm
- Easier to use and more accurate than chemical test kits
- Dedicated to a single parameter
- Small size, big convenience
- Ideal for: Aquariums, Environmental, Aquaculture, Water Quality
Box Contents:
- 2 sample cuvettes
- Cuvette cap
- Starter pack of reagents x 6 tests (re-ordering information: HI-774-25 x 25 tests)
- 1 x 1.5 AAA battery
- Instructions