For advanced pH measurements, the Model 525A offers selectable ROSS Resolution™ to 0.001 pH units, choice of a three point autocalibration (built-in auto buffer recognition of five buffers, pH 1.68, 4.01, 7.00, 10.01, and 12.46) or manual calibration. Easy-to-understand user prompting, and RS232 interface for two-way communication with your computer or connection to optional Thermo Orion printer; 25 point datalogging and custom color vacuum fluorescent display.

Dual channels allow the use of two electrodes at the same time. Designed to switch between channels without a need to recalibrate. One channel can be dedicated to pH and the other to pH, ORP, BOD or mV. Packages that include pH and ORP or pH and BOD electrodes are offered. All meters are shipped with 110 V wall adapter and instruction manual.