Investigators evaluated non-nuclear density gauges for use in determining the in-place density of compacted asphalt pavements in Wisconsin. In field tests, the non-nuclear gauges produced consistently lower density readings than nuclear gauges. To offset these differences, investigators recommended that non-nuclear gauges be calibrated daily at each project site and that technicians take at least 30 readings within each lot to ensure acceptable confidence levels. Nuclear gauges will still be needed for calibration, but this research will help WisDOT minimize their use.