If your lab is focused on water quality analysis, then you will need many electrochemical instruments.
The pH meter helps you detect the pH of the solution.
A conductivity meter is used to estimate the total or salt content of ions in water.
The dissolved oxygen meter is used to measure the oxygen content in the water.
An ion meter is used to measure the concentration of ions in a solution.
The Karl Fischer Moisture Analyzer calculates the water content of the sample by calculating the reagent consumption.
Potential Titrator can used for acid-base titration, redox titration.
A turbidity meter is used to measure the degree of turbidity of the water.