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A drop checker is a little chamber that holds PH indicator fluid separate from your tank water, but with some air trapped in between. When you add CO2 some will come out of the water into the trapped air pocket and then re-dissolve into the PH indicator fluid, making both your tank water and the indicator the same PH, thus you can tell your tank's PH without having to do a test every hour. Here's a thread on how to make one yourself. http://www.aquaticplantcentral.com/...aquarium-projects/32100-diy-drop-checker.html you can also find them on eBay or through our sponsor sites.
 
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