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14) How can I measure the water content?
Until recently, the only way to judge the water content of a stone wool slab was by instinct. Nowadays, however, Grodan’s Water Content Meter (WCM) measures the exact water content of your slabs, thereby enabling you to control the precise variation of the water content during the cultivation of your crop. In addition, you can also use Grodan’s WCM to measure the EC and temperature of the stone wool slabs.
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