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| Categories | First-generation (XEC120U) | Second-generation (GIF-Y0001) | Third-generation (GIF-Y0002) | Fourth-generation (GIF-H290EC) |
|---|---|---|---|---|
| Year developed | 2003 | 2005 | 2009 | 2015 |
| Type | Probe | Integrated (double lens) | Integrated (single lens) | Integrated (single lens) |
| Magnification | Fixed-focus 1,125× | Fixed-focus 450× | Continuous zoom magnification 380× | Continuous zoon magnification 500× |
