I bought a stetzerizer microsurge meter. When I plug it in the early morning it's under 50 but then later in the afternoon it goes up and at night it really goes up and nothing is added. I notice my meter will show a fluctuating # while i check it.
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This is common for the readings to vary at different times of day. It can reflect goings-on on the power grid, people leaving for and returning from work, street lights, and other things.
So it's best to filter when things are the highest. Then you will be protected when things are the worst.