tangigi3
Koi Lover
May 8, 2006, 2:51 PM
Post #1 of 2
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DIY salinity tester
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Hello,
I bought a resun hydrometer for salt water and converted it for .3% and .6% use in my koi pond.
I gently nudged the corners to open up without breaking the plastic. open it up to the point you can get the needle.
once you have the needle, drill a 3/16 hole in the counterweight, the white circular part in the middle. return the needle and superglue the plastic back up.
I got a liter of water and put in 3 grams of salt, did the test 5 times before I marked the .3% salinity level. (make sure you give the needle a good shake to remove all the micro bubbles sticking to it or else you won't get an accurate reading. return all the water back to your container and add 3 more grams of salt and you willl get your .6% mark.
its gonna cost you less than US$4.00
Lar
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