A handheld turbidity meter measures turbidity of a water sample. The meter is calibrated using standard samples from the meter manufacturer. The picture with the three glass vials shows turbidity standards of 5, 50, and 500 NTUs. Once the meter is calibrated to correctly read these standards, the turbidity of a water sample can be taken.
lectometer
Cusec
A thermometer
A flow meter.
a stopwatch
Potometer
dewpoint apparatus
Rain Guage
a graduated cylinder
250 ml beaker
a refractometer
This instrument is a balance.