GeoffreyF , 121GW is very slow in comparison with cheap or expensive multimeters , so stop being a fanboy troll . This firmware program should be scrapped completely and start from scratch with speed efficiency in mind . With a PIC family microcontroller a long time ago many , many users could have done a better firmware .
To add something , autorange hysteresis is 55000 counts up and 40000 counts down .Unreasonable huge . So , when you measure a 470ohm resistor from infinite resistance ( autoranging down ) , it will autorange in the 5K range and you will see 0,4700K .
But if you short the leads first and wait for 0 ohm reading , then measure fast ( now autorange is going up in ranges ) that 470ohm resistor , it will autorange correctly in 500ohm range as 470.00ohm .