Dwyer Instruments CSG:

Compact, versatile, and accurate, the Dwyer Instruments CSG is a differential pressure gauge designed for demanding HVAC applications. Its rugged construction and intuitive interface make it ideal for technicians and engineers alike. Key features include:

Differential pressure measurement range of 0 to 10 inches of water column (inWC)
Accuracy of ±2% of full scale
Large, easy-to-read LCD display
Zero and span calibration buttons
Compact and lightweight design
Battery or AC powered