I was glad to see your post. Thought I had subscribed to the wrong
newsgroup. You said you mow your yard 3"-4" . Can you tell me how you know
the height?

I'm a dork...I take a ruler and measure the height of the grass after
I mow it!

I know that the third notch from the top is 3", and it looks like each
notch is a 1/4" change.