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which is the one used for long holds and denser material
2-in-1 Advance Grow Tent 4x3
It is the printed card packed with retail versions
41 mS/cm in standard calibration mode
TrolMaster MBS-Pro 4-in-1 Sensor for Hydro-X Pro | Temp RH CO2 Light HPS which is the one usedTrolMaster MBS Pro 4 in 1 Sensor for Hydro X Pro and Plus Controllers The MBS Pro consolidates the four climate inputs that drive a Hydro X Pro room. Temperature, relative humidity, CO2 (PPM), and light all read from a single plug and play probe. Built for the Hydro X Pro (HCS 2) and Hydro X Plus (HCS 3) controllers. Does not work on the original Hydro X (HCS 1), which uses the older MBS 1 MBS 2 sensor family. The onboard LCD shows current readings
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