I picked up another PM1 module yesterday to monitor the temperature in my Frag Tank. I don't have an ORP probe so I figured now would be a good chance to add one. I picked up a double junction Milwaukee probe from Amazon. I also ordered some 400mv ORP calibration solution. I went to calibrate the probe last night through the apex display and it was first asking for the Quin-7 calibration solution. I do not have that solution so I decided not to calibrate. I went ahead and just put it into my Frag Tank. It first read around 197 and now it is up to around 247 this morning.
Do you think I need to calibrate the probe or just keep these numbers as a baseline?
Do you think I need to calibrate the probe or just keep these numbers as a baseline?