pH and oxidation reduction potential (ORP) instruments measure or monitor pH (relative concentration of hydrogen ions [H+] in a solution) as well as ORP

Test equipment and instrument repair services test and repair industrial equipment and instruments.

pH electrodes and oxygen reduction potential (ORP) electrodes measure the voltage across a circuit formed by the measuring metal half-cell and the reference half-cell

Test equipment and instrument rental services rent or lease test equipment for electrical, electronic, vibration, acoustic, dimensional, NDT, analytical, environmental, process, EMI/RFI, and other specialty testing, measurement or inspection applications

Water quality testing instruments are used to test water for chemical and biological agents, and to measure variables such as clarity and rate of movement

Calibration instruments use electrical signals or physical quantities to calibrate sensors and meters.

Conductivity meters, dissolved solids meters, and resistivity meters are analytical instruments that measure the conductivity, dissolved solids, and/or resistivity of a liquid sample.