Vaisala WM30 - Manual (Page 7)

Chapter 1 ___________________________________________ General Information
VAISALA___________________________________________________________5
CAUTION Caution warns you of a potential hazard. If you do not read
and follow instructions carefully at this point, the product
could be damaged or important data could be lost.
NOTE Note highlights important information on using the product.
Product Related Safety
Precautions
The device delivered to you has been tested for safety and
approved as shipped from the factory. Note the following
precautions:
WARNING Ground the product, and verify outdoor installation
grounding periodically to minimize shock hazard.
CAUTION Do not modify the unit. Improper modification can damage
the product or lead to malfunction.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent
damage to electronic circuits. Vaisala products are
adequately protected against ESD for their intended use.
However, it is possible to damage the product by delivering
electrostatic discharges when touching, removing, or
inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages
yourself: