Omega HH550 manual Press and hold this button for 3 sec will into

			200mV
		C / F		Toggle button for (		200mV, ℃/℉, HiHi, DATA)
1.		HiHi
				and digit “ o ”.
		DATA
	0
			2V
		Lux/Fc		Toggle button for (		2V, Lux/ Fc, Hi, TIME) and
2.			Hi
		TIME		digit “ 1/2/3 ”.
	1/2/3
			200mV
			dB	Toggle button for (		200mV, dB, LoLo, START)
3.			LoLo
		START		and digit “ 4/5/6 ”.
	4/5/6
			2V
		%RH		Toggle button for (		2V, %RH, Lo, STOP) and
4.			Lo
		STOP		digit “ 7/8/9 ”.
	7/8/9
			20mA
			A/	Toggle button for	(	20mA,	A	/	A,
5.		G/T
		INTV		G / T, INTV ) button and “			”	right	shift
				function.
6.	3'SETTING			Press and hold this button for 3 sec will into
		SETUP		setting mode, press again will end setting
				mode.
				7