Abstract: One or more computing devices, systems, and/or methods are provided. In an example, a method comprises measuring a first charge generated by a first excitation signal and transferred during a first time interval to a first electrode mounted to a container holding a test fluid, measuring a second charge generated by a second excitation signal and transferred during a second time interval to the first electrode, and determining a parameter of the test fluid based on a first charge transfer curve generated based on the first charge and the second charge.