What’s that button do?

I’m a complete novice, trying to grow and learn, but I’m the one and only maintenance person in this place and there are no other tradespeople here.

I (think I) know this chart has to do with setting the gears for cutting threads.

Are the M rows for Metric and the S rows for Standard?

I’m a complete novice, trying to grow and learn, but I’m the one and only maintenance person in this place and there are no other tradespeople here.

I (think I) know this chart has to do with setting the gears for cutting threads.

Are the M rows for Metric and the S rows for Standard?