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SFD-600 series · SFD-600
SFD-600 series

With Magnetic pen  long press "FUNC" button for about 5 seconds, Press ▲ (plus 1),▼ (minus 1) and ◀(left)" regulation to display "1111", press "FUNC" 1 times, enter "SPAN" zero adjustment menu, press “◀” into "H" at the beginning "XX" the existing gas concentration, Pressing ▼ (minus 1), which shows the number reduced to 0 so far.

 Shenzhen suofuda Electronics Co., Ltd.