Review on Low Voltage Tester Klein Tools 69127 by Tutan Hesch

Learn your lesson and stay away from test lights that aren't clear. Red is difficult to see when testing wires that can be damaged by a small current load. You can have 6 volts on a wire on a strand. It will glow, but you'll have to put your nose to it to see it. In normal use, it will glow normally. I just can't recommend it. Visibility is everything. You cannot diagnose what you cannot see.