NOYAFA NF-902 - Manual (Page 9)

4.2 9V battery replacement
For NF-902 Optical light source, available to be supplied by single
9V battery. Open the back cover to install or take out the battery.
When install or take out the battery, the following information may
be helpful for your operation:
◆When the battery energy is lower or no 9V battery installed,
a icon will be on screen.
◆Only an eligible 9V battery can be engaged
◆If no use for a long time, take out the 9V battery in case of
corrosion and damage to internal components.
4.3 Calibration and measurement
Under proper conditions, if this meter can be used in a right way,
a better performance can be guaranteed.
In order to guarantee the performance, it is strongly suggested that
a calibration per year should be implemented.
If there is deviation, please calibrate it again.
4.4 Transportation
When under transportation, keep the meter at the specified
temperature range. And it is suggested the operation should
be done as the follows:
◆Only the original packing material can be used
◆Away from high humidity or obvious temperature variation
◆Away from direct sunlight
◆Away from unnecessary impact and vibration.
Your excellent helper in cable test! 7