Just received and ran to the door to test it on my car. I initially noticed that the spark was rather weak, but then I thought about how it actually works. To make the spark visible, your body is used as a capacitive coupling to the frame of the car you are next to. So the conductivity between you and the instrument cap must be important. So I licked my fingers, grabbed the tool and tried again. Shining bright! If you have trouble, touch the end cap with wet fingers when checking the wire!
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