snippet: Dwyer Instruments, 3000-125PA, 3000 Photohelic Pressure Switch / Gage, 0 - 125 Pa The Photohelic Switch / Gage is a very versatile, precise pressure switch combined with the time-proven Magnehelic pressure gage. Gage reading is unaffected by switch operation. Easy to adjust set points have knob controls. Applied pressure and switch set points are fully visible at all times. Deadband is one pointer width - less than 1% of full scale. Full scale ranges available from 0 - .25 in w.c. to 0-6000 psig.

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