ORP 200, Waterproof ORP & Temp meter
C$144.00
HM Digital - ORP 200, Waterproof ORP & Temp meter available at Valley Indoor.
HydroMaster HM-500 Continuous pH/EC/TDS/Temp Monitor
C$479.99
HM Digital - HydroMaster HM-500 Continuous pH/EC/TDS/Temp Monitor available at Valley Indoor.