General Tools and Instruments UV340 - Manual (Page 8)

2) Storage for the " UV sensor "
UV sensor is with extremely precise structure.
Once don't use it , be sure to store it in the dry environment.
For example, put the whole sensor including Desiccant
( Drier ) into to the Plastic bag and seal the bag as tightly
as possible. Take the sensor out of the bag only when use
it. Comply to above method will extend the life of UV
sensor. Otherwise, the gain of the UV SENSOR may be
decreased and shorten the calibration period. It is also
necessary to replace the Desiccant ( Drier ) periodically.
7. BATTERY REPLACEMENT
1) When LCD display shows " " in the left corner,
It is necessary to replace the battery. However, in-spec
measurement may still be made for several hours after
low battery appears.
2) Slide the " Battery Cover " ( 4-6, Fig. 1 ) away from the
instrument and remove the battery.
3) Replace with 9V battery and reinstate the cover.
4) Make sure the battery cover is secured after changing the
battery.
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0806-UV340