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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.
Nikki
2025-07-30 11:16:59
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.
Littlelunchbox
2025-06-30 17:04:51
it's not the general hydroponics brand, it has a different sticker on it. and it was spilling inside the package.
evltwns
2025-01-29 14:54:01
Easy to use and very accurate.
primojudge
2024-12-02 16:08:46
Fast shipping, accurate items
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