NOYAFA NF-816 - Manual (Page 10)

4. MAINTENANCE
The only field service required for maintaining proper operation is the
periodic replacement of the batteries in the transmitter and receiver.
A. Battery Replacement
B. Cleaning
Periodically wipe with a damp cloth and mild detergent; do not use
abrasives or solvents.
C. Service
Should you need for any reason to return the tester for repair or
replacement takeprior agreements with the local distributor from whom
you purchased the item. Use only original packaging for any transit of
shipment. The manufacturer will not be responsible for any damage to
persons or things.
End of life Caution:
This symbol indicates the equipment
and its accessories shall be subject
to a separate collection and correct
disposal.
WARNING
Before opening the case, remove the test leads from the circuit
and shut off the unit. Failure to observe these warnings can
result in severe injury or death.
Your excellent helper in cable test! 8