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https://www.swelluk.com:443/hanna-nitrite-low-range-pocket-checker/ 
Hanna Nitrite Low Range 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, salt and fresh water aquariums. The Nitrite Low Range Checker is a simple, accurate and a cost effective way to measure low ranges of nitrite. The checker is supplied with reagents for 6 tests. Measuring 0 to 600 ppb NO2-N. Suitable for use in all types of aquaculture (marine, salt and fresh water), nitrite can lead to tissue damage, illness and death in aquatic life, so regular checks can help aquarists to identify rising nitrite levels before fish begin to suffer.
Key Features:
- Nitrite Levels from 0 to 600ppb 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
- 81.5mm x 61mm x 37.5mm
Box Contains:
- Supplied with 2 sample cuvettes and caps
- Starter pack of reagents (replacements will be needed)
- 1 x 1.5 AAA battery supplied
- Instructions