Product Description
SUNS ST-800 proximity switch tester is designed to test most 3 wire DC proximity switches inductives [metal sensing] or capacitives photoelectrics or, ultrasonics. The unit is fitted with 2x 9V batteries ready for use. Standard color coding for 3 wire proximity switches is Brown = Positive Black = Load, Blue = Negative (-) [Note: some universal DC switches can vary, try to follow makers wiring instructions]
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