Apple 575, 577, 560, 550, 500, 578 manual

Adjustments	Light Meter Setup - 23
	To measure a display
	screen’s luminance,
	1 Set the scale switch to
	the bottom position (to
	set up the 10-50 fc
	scale).
	2 Place the lens against the
	middle of the screen and
	read the bottom scale.
	Note: When the light meter
	is not in use, slide the scale
	switch to its top position,
	and store the meter in its
	protective case.
	Important: If you suspect the
	light meter is giving false