They seem fragile. Not indeed they aren’t.
The Inno Instrument fusion splicers are made to last: resistant to water, dust, falls and every other event could happen during the installation.
They are perfect and absolutely reliable for working on-site. If they can stand ruthless mistreatments of operators, visible on the video, they will face without any problem many working hours, moisture, rain, and dust you can find during FTTH installations.
Not only easy to use, with 3 years of warranty, powerful, light but even strong.
Seeing is believing.