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anyone know where i can get one? i've called or visited probably ten stores, no one has them.... anyone have luck?
 

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You can make your own drop checker very easily using a gas permeable membrane instead of an air gap to separate the liquid in the drop checker from the tank water. And, Priority Mail envelopes are made of tyvek, which works fine as a gas permeable membrane. Here is one made from a "sample bottle", the type with a rubber membrane in the cap for sticking a hypodermic needle in: Aquatic Plant Central - View Single Post - DIY Drop Checker
 
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