Widely Range Applications The smartphone photo adapter holder is suitable for eyepieces with 25mm-48mm outer diameter and can be mounted on spotting scopes, monocular, binoculars, astronomical telescopes, and microscope eyepieces. Compatible with Android and iPhone smartphones with a width of 56-99mm / 2.2-3.9", Fits eyepieces with 25-48mm / 1-1.9" diameter. You can capture photos & videos through eyepieces.- Applicable Cellphone This microscope phone adapter ONLY works with the phone width range: 56-99 mm / 2.2-3.9 inch.Note: It is not applicable to most foldable smartphones and small tablets. Devices with a size smaller than 2.2 inch or larger than 3.9 inch cannot use it.- Easy To Use Simply Place Your Phone In The Adapter, Center Your Phones Camera Over The Eyepiece, And Use The Knobs To Secure The Adapter In Place.- Safe & Durable Telescope Adapter For Mobile Is Zinc Alloy Shell, Sturdy Durable And Lightweight. The Phone Clamp Made Of High Strength Pa Plastic And Features Adjustable Locking Mechanism With a Steel Bolt Not a Spring.- Enjoy Exploring Fun This Telescope Phone Mount Allows You To Capture The Beauty Of The World Easily Through Your Screen. Connect Your Phone With Telescope Or Microscope To Explore Far Beautiful Scene And Amazing Micro World.