pH sensors

pH sensors

pH sensors: used to measure how acidic or alkaline a material is. 
The value of 7 shows that the material is neutral, less than 7 is
acid, more than 7 is alkaline. The pH meter has a probe with a bulb
at the bottom containing a sensor. The probe produces voltages for
pH levels. 0 volts at pH 7, -voltages at acid pH, +voltages for 
alkaline levels.

Where can pH sensors be used: 
-school labs
-chemical manufacturing
-aquariums, the pH level must be set at specific point for different
fish and it should be consistent.