Was hoping you wouldn't say that, but it's why I asked.
Modified Square wave output & sensitive switchmode electronics as found in computers & their chargers are not a good mix. It will run them, but will slowly damage them. I was running my laptop from the modified square wave output from a large solar system where we were caretaking for 6 months. At around the 3 month mark the power supply on the motherboard failed. Major inconvenience (but at least I had it backed up), & a new laptop required. Ran the new laptop off the 350w Pure sine wave inverter in our car only. The charger ran cooler & without the very slight buzzing sound it would make if plugged into the modified square wave supply. You may get away with it, but if you have stuff on the computer you don't want to lose (as most of us do) & don't want something you depend upon failing when you need it, it's not a risk I would take.
No problem using it for the angle grinder, vacuum etc. Not sure about the printer, & I'd be cautious about using it with any chargers which may contain any electronic 'smarts'.
A smaller wattage pure sine wave inverter would suit the computer & charging. I also use a 180w for that purpose in our Tvan. My 350w one in the car covers me for the fast charger for my Makita 18v batteries.
Personally I consider the Victron Phoenix range of small pure sine wave inverters to be great - reliable & dependable (unlike some I've had) at very affordable prices..... & they come with a 5 year warranty. No affiliation - just a very satisfied customer.
https://www.ebay.com.au/itm/Victron-...8AAOSwwgBcOAcx
https://www.ebay.com.au/itm/Victron-...kAAOSwhrpcRVHf
Couldn't find a 12v 180 model listed on ebay at the moment, but they are often there. As it is the 250w is cheap enough not to worry about it.