Thanks for your reply, James. In that case, I am interested in a replacement meter so I would take your offer. But I still wonder what happened because I have made sure that there was no way the meter could be exposed to the high frequency 3500 VAC. I know the 3500 V source has a frequency between 6000 Hz and 20,000 Hz. So perhaps there was an impedance problem due to the high frequency. Or perhaps the high frequency damaged the sampling components of the Mooshimeter since it is limited to 8000 Hz. Anyway, if you could send me the coupon, I should be grateful!