Global Scuba Manufacturing Magnehelic Gauge ±5 Inch Scale

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Standard instrument for measuring the breathing effort of dive regulators. This Magnehelic Gauge has dual, 5-inch scales to sense both positive (exhalation) and negative (inhalatio n) pressures. Considered the standard instrument for measuring the breathing effort of dive regulators, this Magnehelic Gauge has dual, 5-inch scales to sense both positive (exhalation) and negative (inhalation) pressures. Breathing resistance is measured in inches of water column, equivocally the respiratory effort required to draw water one inch up a straw! Used with #48101 probe (not incl.) Show more