But if you really want a 10 dollar one, I would first try to get the free one at Harbor Freight (use their coupons) or you can get this one, but it is really terrible but it does get the job done for low voltage DC stuff

https://www.amazon.com/Etekcity-Multimeter-MSR-R500-Electronic-Multimeters/dp/B01N9QW620/ref=sxin_12?ascsubtag=amzn1.osa.369603a4-bc10-4fc2-99c3-81f259507129.ATVPDKIKX0DER.en_US&creativeASIN=B01N9QW620&cv_ct_cx=multimeter&cv_ct_id=amzn1.osa.369603a4-bc10-4fc2-99c3-81f259507129.ATVPDKIKX0DER.en_US&cv_ct_pg=search&cv_ct_we=asin&cv_ct_wn=osp-single-source-earns-comm&dchild=1&keywords=multimeter&linkCode=oas&pd_rd_i=B01N9QW620&pd_rd_r=edf2efbd-ca85-423e-a41c-cdeb0ea2e0c7&pd_rd_w=TEatS&pd_rd_wg=itqKh&pf_rd_p=09ff20e9-945b-4b59-906b-be3bf2ef914a&pf_rd_r=Q4NZMSQ4TV5MD92B6G27&qid=1612294420&sr=1-2-64f3a41a-73ca-403a-923c-8152c45485fe&tag=gadgetreview-tca-20