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The GCC open this file 'Mitras LX 6100 HV light composer project.lpc' in LCPTemplates folder every startup. I just replace it with my project. It work great. Every startup my project file show up.

The black plastic cover for the conductivity probe not the redox probe. I accidental drop it, I wouldn't think it make a different, but it did. I just recalibrated and it work great and double check...

Thanks Carolin for the quick response.
I think I found my problem, I drop the black plastic protective cover for the tip of the probe. I will try calibrate it again later.

I just switch from...

I calibrated the conduct. probe with GHL 50ms, after I calibrated, I place the probe back in the calibration solution it read 52.2 ms. I leave the calibration solution in the aquarium for few days so...