I like these: https://www.amazon.com/gp/product/B00O3K5RSS/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 Not that expensive but do the job well. I also give them to seniors going into science as graduation gifts because its nice but not too expensive.

Yes. https://www.amazon.com/gp/product/B00O3K5RSS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1