Easy to use and seems to work. I don't know if that's really correct as I'm not familiar with salt water. I use it when trying to create water conditions for amanozoa. Some things to keep in mind when using it is that the instructions say you should leave it in salt water for 24 hours before doing the actual test. Once it's ready to test, you should hit the bottom of the ground in a soft, not hard, spot. Found this on YouTube and it seems the dial is moving correctly otherwise the dial just shoots straight up.
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