Phone ⇔ eyepiece adapter

• Tridapter, $55
• Celestron:
  • $21
  • $60 or $67
• https://wilderness3d.com/ — 3D-printed
• Carson adapter clip
  • It's designed to be used in conjunction with their $15 microscope
  • They have a number of different versions.

List of others:

• At B&H Photo
• At Rokslide.com
• https://www.youtube.com/watch?v=HQmdTKR-jWM

Digital microscopes

There are also digital microscopes:

• https://www.amazon.com/dp/B0CPVH11Z6
• https://amscope.com/collections/digital-microscopes-hand-held-microscope
  • https://www.amazon.com/dp/B07LFGZHB2
  • https://www.amazon.com/dp/B07N8J2R9F
• https://www.bhphotovideo.com/c/buy/Digital-Microscopes/ci/12478