My multimeter won't turn on after high voltage spike

Hi @anchefixes,

Looking at this link electric fly swats can generate between 500-3000V so presumably your fly swat is in the range above the rated range of the DMM.

The meter can measure up to 1000V DC and up to 750V AC so if it were more than the expected 280-400V but less than the rated range it shouldn't have been affected. Even if the meter was set on 200V DC scale it should have registered a "1" indicating out of range as it has over voltage protection built in as long as the expected voltage was within the rated range of the DMM.

If the fly swat voltage is below 1000V DC, hopefully the meter was set on DC volts (or even AC volts if it were <750V). Any other measurement type setting i.e amps, resistance etc would have damaged it.

The 600V Cat II rating is used to protect the user more than the device itself.

Here's the schematic for the meter which may help. I don't know what it shows as I don't have a program that can open .axd file types.

Also even if you fix it, given that new components would have been installed, you may need to either find a service manual or a certified testing instrument calibration service to make sure that the meter is still calibrated correctly to give accurate measurements.