Also 0.2 to 0.5 ohms is VERY difficult to measure without a 4 or 5 wire ohmeter or a 4 terminal measurement. Your test leads and internal meter connections can EASILY have 1 ohm of resistance each.

A way to measure low resistance values is to measure the current through the device and the voltage across it. You can add series resistance and measure the voltage across the known resistor and convert that to a current.

If I'm right, your meter is not capable of measuring 0.2 to 0.5 ohms.