Amazon.com: Digital Manometer, Dual Port Air Pressure Meter Pressure Gauge HVAC Gas Tester, Differential Pressure Manometer with 5/16 Inches Diameter Pressure Port, Hti-Xintai : Industrial & Scientific
Dwyer 490A-4 - Wet/Wet Handheld Digital Manometer, 0 to 100 psi (0 to 689.5 kPa) | TEquipment
HT 1890 Manometer
Amazon.com: Mengshen Digital Manometer, Professional Digital Air Pressure Meter & Differential Pressure Gauge Kit - ±13.79kPa / ±2 psi, M1890 : Industrial & Scientific
Manometer Hand held manometer with easy to read display, Self-zeroing 750-926
Series 490A Hydronic Differential Pressure Manometer