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5.8 Usage of Calibration Reference Mark
Before using PD meter, we recommend you check whether the
display value is normal and to perform “the inside check of PD
46mm”.
Slide C3 Benchmark hairspring and make it coincide with C2
Calibration reference mark, if the PD is 46mm with left and right PD
being 23mm respectively, it is normal.
6. Clean and disinfection of application parts
1
）
Do not use any corrosive chemicals when cleaning the product.
2
）
Nose bearer and forehead bearer are the parts that are in frequent
contact with testee, which should be cleaned and disinfected
promptly. Dirt should be cleaned with soft cloth dipped in soluble
cleaner or water, then wipe the product with medical alcohol to
disinfect. It is recommended to do this before each test.
7. Maintenance
1
）
It has been precisely adjusted before delivery. Please do not
dismantle it so as to keep it precise.
2
）
It shall be stored and used in an indoor well-conditioned dry place.
3
）
As a high-tech product, the device shall be prevented from
vibration or impact.
4
）
Keep it clean and do not touch surface of its window glass.
5
）
Any corrosive chemical is forbidden for cleaning it.