Im not sure what touch test you think I mentioned. I didnt use my finger or my tongue or my lip for sensing the temperature. I did it like that when I did not had any professional equipment and when I didnt know better. But now, I use a digital thermometer TM-902C shown in the picture. That black pliers is used there as a weight to keep the wire on position over the body of the resistor.Certainly that "touch test" is very subjective.
by Aaron Carman
by Duane Benson
by Jake Hertz
by Duane Benson