Is there an affordable way to test for ammonia with a digital display?

ammonia on aquaponics systems: question Blowhole : Is there an inexpensive way to test for ammonia with digital Is there a way to test for ammonia in water, where you have a digital display, rather than liquid or Reagants use webs to obtain an estimate of ammonia color chart? Preferably low-cost, but if it is not there period? Or is it impossible to test for ammonia in this whiskey as follows: It is for the aquarium water. Ammonia is toxic to fish and what do most people, only with test

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