ORP Test Solution 240 mV @20C (Special Order)
ORP Test Solution 240 mV @20C (Special Order) at HorticultureSource.com -
Hanna Instruments ORP Test Solution 240 mV @20°C (HI7021M) ORP standard solutions allow you to test the precision of ORP electrodes. For example, by immersing the electrode in HI 7020 solution, you should read within the 200 to 275 mV range (@20°C/68°F).     Manufacturer's Product Information MSRP each $ 25.97 Dimensions 2.7 x 7.6 x 2.7