Hopefully my reply to xupybd above should share light on calibration. The device doesn't have onboard memory, so you use the software to get calibration data, t

Hopefully my reply to xupybd above should share light on calibration. The device doesn't have onboard memory, so you use the software to get calibration data, then save it to either your program file, or save/load to a file, memory, db etc depending on your setup. I don't have a specific recommendation, but have been using this myself. More expensive than ideal: https://www.amazon.com/Biopharm-Calibration-Solution-Standards-Traceable/dp/B01LVVAKEM/ https://www.amazon.com/Biopharm-Calibration-Solution-Standar.... The packets are cheaper, but require you to have distilled water.