Product information "HI7021L - 240mV ORP Test Solution - 500ml"
ORP Solution for Platinum and Gold Electrodes. Reads 240 mV @ 25°C/77°F ORP standard solutions allow you to test the precision of ORP electrodes.
If the reading is outside the indicated interval, clean and condition your ORP electrode in HANNA® pretreatment solution. Use HI 7092 for oxidizing or HI 7091 for reducing pretreatment.