A consumables monitoring system is in communication with computing means and has a dispenser assembly formed of a dispenser and a mounting unit. The mounting unit and dispenser are arranged such that a plurality of sensors in the mounting unit is able to measure the quantity of consumables in the dispenser, and the dispenser assembly communicates sensor data to the computing means, which thereby monitor the usage of the dispenser. The plurality of sensors have different sensitivities over a range of inputs, wherein system is configured to switch between the sensors depending on the value of the inputs detected. The fact that the mounting unit may engage multiple different types of otherwise stand-alone dispensers provides for a monitoring system that can be used in conjunction with any type of dispenser and consumable. The plurality of dispensers allows for optimum sensitivity across a broad range of dispenser fill levels.