Betcha Didn't Know...

If you hit the F1 thru F12 keys in HydraCALC while in the Diameter column, it will place the nominal diameter assigned to that key into the Dia. slot! That way to can keep typing along, using only the keyboard and no need to reach for the mouse...

F1 = 1                    F7 = 4
F2 = 1 ¼                F8 = 6
F3 = 1 ½                F9 = 8
F4 = 2                    F10 = 10
F5 = 2 ½                F11 = 12
F6 = 3                    F12 = 14

This was added in HydraCALC V50.14 about one year ago.