Hanna ORP 200/275 Standard Solution – HI 7020M

The ORP Standard Solution allows you to test the precision of your ORP Electrodes. For example, by emersing the electrode in the HI 7020 solution, you should read within the 200/ 275mV range @ 20deg.C. If the instrument is outside this range, clean and condition your ORP Electrode in the Hanna pre-treatment solution. These are not held in stock but we can supply.