Leica MATEO TL Instructions D'utilisation page 23

Preparation
Before performing any experiments, please set up your microscope according to the following instructions.
Microscope should be used in a dust-free room, which is free of oil vapors or other chemical vapors, as well as extreme humidity. At the
workplace, large temperature fluctuations, direct sunlight and vibrations should be avoided which may distort measurements and micrographic images.
If you want to put the Mateo TL inside a laminar flow hood, you should check in advance whether there is a cable port inside the flow hood.
MATEO TL Microscope User Manual Preparation 20