Rather than merely having a dedicated smartphone dermatoscope that is specific to a single smartphone, you can use any DermLite DL1, DL2, DL200, DL3 or DL4 with any iPhone as well as virtually any other smartphone.
Dermlite makes smartphone-specific Connection Kits for any iPhone and the Samsung Galaxy S series, and should you have a different smartphone, simply choose the Universal Smartphone Adapter which will work on virtually any smartphone, also making it a great choice if you are one to change phones frequently.
