It's a shadowing microscope with 40-100-400X total magnification. There are more details in another reply, I'll try to share the link: nostr:nevent1qqsg0h0x76hvq4lmsxrvc5q702laksseqh40patvvtj6dy27jpvq0jcpvemhxue69uhkv6tvw3jhytnwdaehgu3wwa5kuef0dec82c33d33k27nwwgekvdpjxemkxvn8xd3hyerpd4n8jwtrwpjkcuekwuukwvecwa48gmfkw4n8ydekvaarxanxdfekkurhxsmrg0mzwfhkzerrv9ehg0t5wf6k2qg5waehxw309aex2mrp0yhxgctdw4eju6t0qyg8wumn8ghj7mn0wd68ytnhd9hx2qgkwaehxw309aex2mrp0yhxummnw3ezucnpdejqzrthwden5te0dehhxtnvdakqvryxyz