http://www.growell.co.uk/grow-room-tools/measuring-tools/manual-ph-tester.html3681Manual pH Testerhttp://assets.growell.co.uk/media/catalog/product/p/h/ph-test-indicator_web.jpg5.50GBPInStock/Nutrients & Boosters/Grow Room Tools/Nutrients & Boosters/Nutrient & pH Management/Grow Room Tools/Measuring Tools<p>It is possible to test the pH of your nutrient solution without using electronic meters. We offer a cheap and simple to use manual pH tester.</p>5.50
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