Teslong USB-C Digital Microscope, 10X to 200X Magnification Portable Camera with 8 LED Lights, Handheld Rotating Metal Stand for Coin, Electronic, Compatible with iPhone 15+ and Android Devices

$32 microscope that works with your phone: https://www.amazon.com/dp/B0DQKBZT7B?ref=nb_sb_ss_w_as-reorder_k1_1_7&=&crid=1UHJBQN66YY47&=&sprefix=teslong

I bought something like this to inspect using my phone. https://a.co/d/08onWOT3. It does a pretty ok job.