Thermo Scientific Advanced Benchtop pH/mV/ORP Meters

Model 520A Plus features easy-to-understand user prompts, selectable ROSS resolution* to 0.001 pH units, choice of a three-point auto calibration or manual calibration, 25-point datalogging and bi-directional RS232 interface for connection to a computer or Orion Model 900A printer (246-11590). 110V.
Model 525A is similar to Model 520A with the added feature of dual electrode inputs and channels. It can switch between channels without the need to recalibrate. One channel can be dedicated to pH and the other to pH, ORP, BOD or mV. 110V.
Model 550A dual channel, multiparameter meter. Features simultaneous pH, conductivity and temperature. Flexible calibration, temperature compensation and automatic datalogging options. 110V.

Starter kit includes: ATC probe for conventional electrodes, electrode holder and stand, buffers, and electrode storage solution