You really can’t. You can get a testing probe like this: http://www.seedandgarden.com/shop/product_images/e/1840_soil_ph_meter_rapitest__22586.jpg

It’s not that expensive and you can use it year after year.

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Swiffer SweeperVac Starter Kit $35.77 Swiffer SweeperVac is a hard floor power sweeping system. SweeperVac uses the textured Swiffer Dry Sweeping Cloth to trap and lock fine dirt and dust while its powerful vacuum grabs the larger particles like crumbs. Don’t mess with dirt piles and dustpan lines – SweeperVac gets it up. Assembly required. 7.2V.Hard floor power sweeping system cleans better than a broom and dustpan. Dry Swiffer Sweep…

pH Control Kit – General Hydroponics $12.75 Contains Ph Up (add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level), Ph Down (uses food grade Phosphoric acid to lower the pH to the proper level), and Ph Test Indicator (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)….

Watersafe WS425W Well Water Test Kit $24.95 We’re Just Testing The Waters… Water test before we dip our tongues into it. You might want to, too. Try Watersafe®, a single-use kit made for testing well water that will detect coliform bacteria, pesticides, nitrates, lead, iron, chlorine, copper and hardness. Includes an instruction manual and EPA drinking water standards. Easy to use, with results on the spot….

4 each: Professional Lead Surface Test Kit (LS104) $3.99 Sold as 4 UNITS at $9.84 per unit. (1 unit = each.) Contains 6 tests (non-toxic). Detects lead on any surface. Safe, easy to use. Laboratory tested for accuracy. Clamshell. Manufacturer number: LS104. SKU #: 5272810. Country of origin: (TBA). Distributed by Professional Laboratories, Inc….

Audrey Ep $13.77 …

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