In short, yes you can. The miniPID is calibrated for propylene initially and can always be used to measure relative concentration, by far the most common means. However, to measure absolute concentration you will need to calibrate your miniPID unit using known concentrations of your odorant or by mixing pure odor with clean air using a rotometer or mass flow controller system. Alternatively, you can use an odor with the same ionization potential as your odor of interest in the same manner.