A commercially available Cartesian coordinate (gantry style) robot has been programmed to sequentially determine soil/water pH (pHw) using a desk‐top computer, electronic switchbox, pH meter and a bank of five combination electrodes. All movements of the robot together with pHwdata acquisition are orchestrated by the computer. Once the pHwdata has been acquired, it is stored in an array for subsequent transfer to a Laboratory Information Management System.