Guys, I just got myself some electro static measurement probe and PCB attached to it. Suppose to be working, and I can probably check the output easily. Question is, how do I know it is measuring somewhat in the ballpark region ? Doesn't need to be 1% accurate but not in the 50% region as well.. I'm thinking of rubbing my hair... but what will be the reading for that ? 7kV ? or will it be a large possible range that is quite useless to see whether the device can indeed work and measure somewhat reliably ?