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Ammonia Alert detects and continuously monitors free ammonia in marine or freshwater aquaria. The sensor, located in the center of the reference scale, changes reversibly from yellow to green to blue relative to the ammonia concentration. Freshwater Only. Date Added: 11/07/2011 by Philip Tata
 The price is good and it's from a reputable manufacturer: I love their products generally. Nevertheless, the "illumination" on the dials is not that easy to read, especially on the ammonia alert. (This is after more than a week, so it should have equilibrated by now.)
Date Added: 12/02/2011 by Michael Kane
 These are a great and simple way to constantly check the condition of your water. They start giving a reading in about an hour and doesn't take long to change if there's a problem with the water. I've seen them for around £9 each so for this price together its a real bargain A+++++
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