![Nidek Medical HandyRef-K Operator'S Manual Download Page 52](http://html1.mh-extra.com/html/nidek-medical/handyref-k/handyref-k_operators-manual_1688062052.webp)
46
OPERATING PROCEDURE: Startup and Shutdown
•
When “WINDOW CHECK NG” is displayed:
Turn off the device, then check that the measuring
window is clean. If not, clean it.
• The measuring window is checked for cleanliness before the first measurement every time the
device is turned on.
Regardless of the result (“WINDOW CHECK OK” or “WINDOW CHECK NG”), the check is not per-
formed from the second measurement.
However, the device may be set so that window check is only performed at the first startup of the
day.
For the setting,