User Guide
2 Safety and the environment 
4 
2  Safety and the environment 
2.1.  About this document 
Use 
>  Please read this documentation through carefully and 
familiarize yourself with the product before putting it to use. Pay 
particular attention to the safety instructions and warning advice 
in order to prevent injuries and damage to the products. 
>  Keep this document to hand so that you can refer to it when 
necessary. 
>  Hand this documentation on to any subsequent users of the 
product. 
Warnings 
Always pay attention to information that is marked by the following 
warnings with warning pictograms. Implement the specified 
precautionary measures. 
Representation Explanation 
 WARNING 
Indicates potential serious injuries 
 CAUTION 
indicates potential minor injuries 
NOTICE 
indicates circumstances that may lead to 
damage to the products 
2.2.  Ensure safety 
>  Only operate the product properly, for its intended purpose and 
within the parameters specified in the technical data. Do not 
use any force. 
>  The testo 330 must be checked before commissioning for any 
visible damage. Do not commission the testo 330 if there are 
signs of damage on the housing, mains unit or supply lines. 
Electrical risk. 
>  Do not perform contact measurements on non-insulated, live 
parts. 
>  Do not store the product together with solvents. Do not use any 
desiccants. 










