Is there a DMM that can measure brief power line 'brownouts'?

[amspire]

And a part roll of printer paper that appears to be thermal paper.

It a very standard size of thermal paper. Any good office supply store will have it.

[noidea]

A matter of using the right tool for the job.   The HIOKI I use has different ways to collect the data.  I can say for example, collect data once every hour but if something falls out of spec (and those triggers can be fairly complex) then collect that.  The unit can measure three phase for both current and voltage and has a spare channel (which has saved me more than once).

Hi Joe,  I know this is an old thread but do you mind telling me the model of the Hioki meter you are using?

[vk6zgo]

Back in the day, they used a recording voltmeter/chart recorder.
This was usually an analog voltmeter guts driving a pen on a continuously moving chart.
It required the replacement of the ink & paper roll from time to time, but gave you a permanent record
with elapsed time since it was turned on.