I have a really old version, made by Triplett IIRC. Two vertical needles, one meaures voltage and the other, amperage. Looks to be 30s-40s vintage and works slick. Reminds me of an old aircraft instrument. ~ Todd, KA1KAQ On 7/22/07, ronnie.hull <ronnie.hull at glowbugs.com> wrote: > I've had one of these for a while now, nice little gadgets!