Intended Use - TESTO 770 Instruction Manual

• High-frequency electromagnetic fields (HF) can influence the
measurement result and result in the wrong information being
displayed. This influence is temporary and will not damage the
measuring instrument in any way. As soon as the measuring
instrument is removed from the influencing HF field, its original
accuracy will be re-established. Known sources of these high-
frequency electromagnetic fields are radio or mobile telephony
equipment, for example. If this type of equipment should influence the
measuring instrument, switch it off or increase the distance between
the equipment and the measuring instrument.
• The instrument must not be used while its battery compartment is
open.
• Batteries must be checked before use and changed if necessary.
• Storage areas must be dry.
• If there is any battery leakage, the instrument must no longer be used
until it has been checked by our Customer Service.
• The battery acid (electrolyte) is highly alkaline and electrically
conductive. Risk of acid burn! If the battery acid comes into contact
with your skin or clothing, thoroughly rinse the areas affected
immediately with plenty of water. If battery acid gets into your eyes,
rinse them immediately with plenty of water and seek medical advice.

4 Intended use

The instrument may only be used under the conditions and for the purpose
for which it was designed:
• The instrument conforms to measurement category CAT IV with a
rated voltage of 600V to earth.
Measurement category CAT IV is for use at the source of voltage
installations, e.g. building connection, main fuse, meter.
The instrument may only be used in the fields of application described in
the instruction manual. Any other application is considered improper and
untested usage, and can result in accidents or damage to the instrument.
Any misuse will result in the complete invalidation of any warranty or
guarantee claims against Testo.
The manufacturer is not responsible for any damage to property or personal
injury resulting from the following:
• Failure to observe the instruction manual
• Instrument modifications not approved by the manufacturer
• The use of spare parts not approved by the manufacturer
• Use under the influence of alcohol, drugs or medication
The instrument must not be used for the following circumstances:
• In potentially explosive atmospheres: the instrument is not explosion-
proof!
• When there is rain or other precipitation: risk of electric shock!
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