Hm TDS-3 Handheld TDS meter active air Blue 1/2" fill-and-drain tubing

Blue 1/2" fill-and-drain tubing

This easy to use CO2 controller determines precisely when to activate and shut-off CO2 generators to maintain user-defined LOW and HIGH CO2 values in the grow room

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This is the real deal from Humboldt County

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Hm TDS-3 Handheld TDS meter active air Blue 1/2" fill-and-drain tubingIdeal for commercial use, the TDS 3 includes a carrying case with belt clip. It is highly efficent and accurate due to its advanced microprocessor technology. It features a measurment range of 0 9990 ppm. From 0 999 ppm, the resolution is in increments of 1 ppm. From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking image.