The UEi EM152 is a digital manometer that measures differential,  positive or negative pressure. A simple hose barb connection for quick  coupling to either the included tubing or customer supplied tubing. 
The  EM152 measurement range is ideal for testing ventilation and AC  systems, spot checks for cleanroom, or any gas pressure system  troubleshooting. Easy operation and a backlit display make this an  indispensable testing tool for  HVAC technicians, maintenance engineers,  and research scientists. With protective overmolding for real world  work environments. 
EM152 is backed by a 1-Year limited warranty.