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Your cart is empty.Fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator, and observe the coloration of the liquid in the test vial. Use 3 drops per 5mL of solution.
primojudge
Reviewed in the United States on February 24, 2015
Fast shipping, accurate items
evltwns
Reviewed in the United States on August 11, 2014
Easy to use and very accurate.
Littlelunchbox
Reviewed in the United States on February 20, 2014
it's not the general hydroponics brand, it has a different sticker on it. and it was spilling inside the package.
Nikki
Reviewed in the United States on October 5, 2014
always a good backup in case the ph pen is reading funny, and 8 oz's will last a long while. Can't go wrong with the price, and I just re-use the old small Gen Hydro dropper to fill the sample with the correct number of drops.
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