My measuring instruments

This is a measuring instrument that can measure pH and DO (oxygen concentration in water) at the same time in the field. Its condition became wrong at the end of last year.

I’ completely forgot to fix it then, and I noticed that it must be fixed before today’s fieldwork. So, I exchange its electrode and corrected the indication. And the performance was checked.

Moreover, I noticed that the condition of electronic balance was not good. It must be used for calculation the concentration of activated sludge. Ordering new one right now, it turned out that it will arrive here this week. So, I was reassured.