Hi AlphaFrog,

I have come across a further problem. I have reduced the min, max and increment values to 0.07, 0.15 and 0.04 respectively. This results in Run-time error '6': Overflow occurring.

I have attempted to rectify this by changing 'As Long' to 'As Double' but this has not solved the issue.

Do you know why this error is occurring?

HU