Nocs Provisions Inspector Microscope 4X Multiplier Lens, Waterproof 32x Power Zoom Accessory Attachment for 32-50mm Optics, Fully Multi-Coated Lens for Magnified Views of Insects & Flora

I'd recommend and 8x32 or a 10x32 or 10x42. If you're willing to consider a monocular, I really like this one: https://www.amazon.com/dp/B0CSYLBW1N?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1 It has available an attachment to make it a microscope too! https://www.amazon.com/dp/B0C33W1LP3?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1 Together they cost about $125.00. My only complaint is that there isn't a case available that can carry both parts safely.