# Resistance Display Format Selector

The frequency display format selector allows you to choose how to plot the resistance data.

## Raw resistance

In raw resistance mode, the data is displayed as the actual resistance reading from the QCM200. This is a number in Ohms, and will depend upon the viscosity of the medium the probe is operating within. The more viscous the medium, the higher the resistance the oscillator encounters.

## Relative Resistance

This mode allows you to plot the data as a resistance shift from a reference point. That is, the current resistance value is plotted relative to a reference resistance which you set via the Zero Rel R button.
Note that when the software begins data acquisition, the first resistance read from the QCM200 is treated as the reference resistance until you set a new reference resistance. See the help entry on Zero Relative Resistance for more details.