This is the same REED R3525 pH/mV meter body, but packaged as the KIT3 bundle for users who also need ORP and conductivity readiness out of the box. Included are an ORP electrode, pH 4.01 and 7.00 buffer solutions, a 1413 uS conductivity standard solution for probe calibration, and a power adapter for continuous bench use. It keeps the R3525's core feature set (ATC, dual LCD, automatic buffer recognition) while giving field technicians a more complete water-testing toolkit in one case.