Well It has been 8 weeks since I last calibrated my probes, way overdue but my vacation etc. messed up the time table, so I decided to get it over with last night.
I figured it would be a good idea if I shared the info as it will enable us to better understand how often the probes need Calibrating and if there is any pattern in the way they lose calibration. I hope other will post there results also.
I used Pinpoit 7 & 10 fluid for pH, Red Sea 450 mv for ORP and 53ms fluid for salinity.
After 8 Weeks
Salinity was reading 51.8ms, off by -1.2 ms or 2.2%
pH 10 read 10.06
pH 7 read 6.8
Orp 450 read 452 mv
All in all I am very impressed, the Salinity probe is working much better now that I clean it off every 2-3 weeks. The ORP probe is really great, I am going to stretch out the Calibration perion on the orp to 4 Months and see how well it maintains it's reading.
The only negative was the pH 7 reading, I believe that was caused because the last time I calibrated it I may have messed up things so I will leave final judgement on that till the next calibration.