HM Digital PH-200 Waterproof pH/Temperature Meter GR16045 and these are suitable for

and these are suitable for saltwater operation

6 - 36" mesh trays

Mode of Action:

this means it is safe for your soil

using 35% less power than a 1000W DE fixture

HM Digital PH-200 Waterproof pH/Temperature Meter GR16045 and these are suitable forFEATURES Measures pH and temperature Auto ranging three point calibration with digital fine tuning Includes 4 pH buffer solution in a sponge embedded in a clear cap, so you can see if it's dried up Waterproof housing Simultaneous temperature display Measurement Range: 0 14 pH Digital Calibration (push button)Auto off function, data hold function and low battery indicatorDisplay: large and easy to read LCD screen includes simultaneous temperature