Sekonic SR-1800 Operating Manual page 42

[Part of Reading Sensor Area to Clean]
Lift the reading sensor unit and clean the surface of the lens on the bottom of the
Reading sensor area reading sensor unit. For the device of double-sided reading specification, clean the
surface of the lens on the main body side.
CAUTION
You can lift the reading sensor unit approximately 15mm. Slowly move it vertically up and
down, and be careful not to hit the unit against other parts.
Reading sensor unit Reading sensor unit
(4) Reattach the top cover.
SR-1800