Hahahha, I have one of those. Good for checking batteries or other random readings. Helped me with customer support when my solar attic fan was crapping out; provided the reading and they sent me a new fan motor assembly for free.
I wouldn't use it for scientific research but it works.
Ive had good luck with Ridgid brand tools as Home Depot will stand by them. Mitre saw, drill/driver set, nailer, a few more. Have a real nice Hitachi hand saw (magnesium) that HD actually had repaired for me for free when the depth/bevel adjustment came loose.
I like to buy quality, mid-grade tools for the most part, but Harbor Freight is good for the disposable stuff. Then again, I may or may not have used the free tool rental option at HD and Lowes (they knew me as a regular at their return desk a few years back....)
I justified buying decent to nice tools when we bought a house in 2010 and I did most of the work myself. What I saved in labor and materials that weren't marked up easily justified what I spent. Beside, any self respecting homeowner should have a few of the basics.