Selecting Run Diagnostics performs a series of self-tests on the datalogger to check for problems with the battery, memory, pressure/temperature/conductivity sensors. If an LTC Levelogger fails the Conductivity Sensor Test, this could mean that you have not calibrated your LTC in a while (~1 year). It is recommended that you perform a conductivity calibration, then 'Run Diagnostics' again. If any of these tests fail then a report should be created and emailed to Solinst Technical Support.
Figure 11-3 Run Diagnostics - iOS
Figure 11-4 Run Diagnostics - Android