ph adjusterGeneral Hydroponics pH Control Kit (pH Up, pH Down, Test Indicator)★★★★★ 4.7~$22Buy Now on AmazonSee full details
tds-meter
HM Digital TDS-3 Handheld TDS Meter with Case — 0-9990 ppm, ±2%
★★★★½4.6 / 5
~$18Buy now on Amazon (opens in new tab)About this product
The TDS-3 adds a protective carrying case and tighter ±2% accuracy over the budget TDS-EZ — worth the upgrade if the meter travels between multiple grow sites.
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