Rick - make sure you use an ink that can be removed. The next owner may not want that, and you may get less for the amplifier when reselling it. On 4 Mar 2014 at 18:16, Rick - DJ0IP / NJ0IP wrote: > I always marked the danger zone for Ig by drawing a > red > line on the plastic meter front with a permanent marker (Sharpie or > Eding).