Timbersports Sawing GaugeTimbersports marking gauge to easily mark out your sawing log. Gauges don't get much easier to use than this cracker. It can easily and quickly mark out lines on your sawing log with clean accurate lines with the provided crayon. Simply insert the crayon into the hole at the required distance and roll the gauge around the log for a perfectly straight line that is consistent and easy to see. When the crayon gets blunt, the gauge has its own sharpener