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