That is better than nothing but it would not be my first choice...
That one monitors the plug, Open ground, swapped hot/neutral that kind of thing but 90 volts it ignores (and at 240 it may go off like a firecracker and then all your spike supression is history)
The one in the link below monitors volts and shuts down if too high or low. It also reports Amps (but will not shut down based on over current. just reports it)
Plug into 240 volts and it alerts you AND protects you
Open ground it alerts you and shuts you down (Mine is the 50 amp hard wired version and did just that a few weeks back. Park finally fixed it)
Open neutral (50 amp only) same (on a 30 amp that will show up as over/under voltage)
Power blink (IE: a 2 second power outage very hard on Air Conditioners) it shuts you off for just shy of 3 minutes (Protects A/C) .
Way way way way better than the one in the subject line
OH and there is a blue tooth remote for the portable and a plug in remote for the hard wired (Which has no display by the way.. The display is the remote)
I have the hard wired.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times