Is it possible to "clean up" my older generator's power for sensitive electronics?

[Smokeydog]

Szliyands 3pcs Digital Display AC Voltage Indicator, 22mm Square Head LED Voltage Tester AC50~500V Voltmeter Monitor Green red Yellow Amazon.com

Hard to beat an analog tractor gauge for dusty, wet, hot, inpact and vibration conditions. Generator going to be in kinder climate comparably.