A modular system and method for testing and measuring various physical and chemical properties of substances includes a user interface unit having a micro controller, a power source, a display, and an input device; and a sensing module having a sensor probe, a signal conditioner, and a sensor controller. The user interface unit and the sensing modules are in electrical communication with one another such that sensor data generated by the one or more sensor probes, corresponding to one or more properties of the substances, is transmitted to the micro controller of the user interface unit. The user interface unit can be used to remotely view, test, record, and analyze data obtained by the sensing module, which module may be located at a remote location. The user interface unit and the sensing module may be in wired or wireless communication according to various known wired and wireless connection means.