In certain models we need to be able to change the scale of the chart axes function of the result of a simulation. Excel charts do have auto-scaling as a default option but sometimes the scaling values we get are not what we need. Another reason against using auto-scaling is that during the time the model runs, the scale self-adjusts and it gives an ever changing, distorted view of the results. A fast and easy manual zoom option is preferred. This tutorial will handle that, namely it will create a VBA macro which can independently change chart axis scales between 1 to 10000 (in oscilloscope style: 1, 2, 5, 10, 20, 50, 100 …). Thanks, Jean-Marc for your VBA suggestions.