Brand
Oakton
Oakton, part of Cole-Parmer, builds water quality instruments, and the product here is a portable pH, mV and conductivity meter.
Electrode selection matters as much as the meter, since a general purpose glass pH electrode fouls quickly in difficult samples. Automatic temperature compensation is essential for comparable readings.
The Oakton EW-35618-90 is a portable pH/mV/Conductivity meter with a backlit LCD, ±0.01 pH accuracy, and up to 6-point calibration. It features Grip-Clip™ electrode holder, RS-232/USB data output, and waterproof design for reliable field or lab use.