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ScubaPro Pressure Gauge SPG

ScubaPro SPG (Submersible Pressure Gauge)  
Your SPG displays how much air remains in your tank so that you can end your dive well before you get too low. An SPG can either be a mechanical gauge connected by a hose that reads the pressure in bar (metric) or psi (imperial, pounds per square inch) in your tank, or it may be built into your dive computer. 

Durable brass case
ScubaPro's smallest pressure gauge

Choice of: Imperial 0-5,000 PSI range or Metric 0-400 Bar range