Hanna HI-98194 Multiparameter Water Quality Meter 

Hi there, can you make a video of how to calibrate the meter (especially the DO probe)? how to clean the electrodes if used for hydrocarbon impacted groundwater? Thank you

2:45 Why not distilled water in place of tap water for rinsing? How disttilled water destroy the pH sensor?? Explain??

once done using the meter do I need to replace the pH cap?

How price of it