too much magnification will get difficult to hold steady. Even with 30-60X you'll get up nice and tight to that bud. to see and even closer with greater magnification.
A glass lense is a feature i look for.
the cheap currency checkers are great options.. jeweler's loupes, too... most will be advertised as both interchangeably. If you go through amazon or similar, read the comments. i bet you'll see some of the people are pot growers and will mention if it's good enough or not. as always, lots of exaggeration in specifications. I have a "30x" that is definitely short of 30x, but still works well enough.
Not a recommendation, just an example that you can find a cheap one
https://www.amazon.com/illuminated-Jeweler-Kare-Kind-package/dp/B015RINTFM/
I had one like these. think the lense is plastic. i wasn't a fan of this model but was sufficient. The phone clip-on accessories for this type of scope suck. If you find one that form-fits your phone, that'll work a lot better if you want pictures. The desktop microscopes will give the best images, but also can't be hand-held due to magnification, so it takes dry buds or cutting something off to use them.
Ahh, one marijuana grower in 'top' comments (c kearney) saying basically the same things i said.