Put the boat in the water and turn the unit on and move it around in the bilge to see if it reads in the area you want it, if it doesn't then the glass has a air bubble in it so stay away from that area.
__________________
Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
|