HVAC Manometers Dual-Port Air Pressure Tester ±30Psi/206.8Kpa

AP-189B Professional Differential Pressure Manometer This handheld digital manometer delivers precise differential, positive, and negative pressure measurements for HVAC technicians, maintenance engineers, and field service professionals. With 11 selectable units and a wide ±30 psi range, it is an essential tool for HVAC system calibration, natural gas pipeline pressure testing, ventilation troubleshooting, air quality monitoring, and appliance installation. Key Features High Precision Measurement: ±0.3%FSO accuracy at 25°C, ±0.25% repeatability, and ±0.1%FSO linearity/hysteresis ensure reliable results on every job.11 Selectable Units: Instantly switch between psi, kPa, kgf/cm², oz/in², bar, mbar, inHg, mmHg, inH₂O, ftH₂O, and cmH₂O — no manual conversion needed.Dual-Port Design: Measure pressure difference between two points simultaneously, perfect for filter monitoring, duct airflow balancing, and valve testing.Data Recording & Hold: Built-in recording mode captures MAX, MIN, and AVG values. Data Hold function freezes the display for easy documentation.One-Touch Zero Setting: Quickly calibrate the baseline before each measurement to ensure accurate readings.Clear Backlit Display: Large LCD with backlight ensures easy reading in dim environments such as basements, utility rooms, and crawl spaces.Smart Power Management: Auto power-off after 25 minutes of inactivity preserves battery life. Low battery indicator alerts you before power runs out. Technical Specifications Measurement Range: ±30 psi / ±206.8 kPa / ±2.068 bar Accuracy: ±0.3%FSO (at 25°C) Repeatability: ±0.25%FS Linearity/Hysteresis: ±0.1%FSO Over-Range Limit: 30 psi Operating Temperature: 0°C to 40°C (32°F to 104°F) Storage Temperature: -10°C to 60°C (14°F to 140°F) Power: 2 × AAA batteries (included) Dimensions: 160 × 62 × 31 mm Weight: 134 g Package Includes 1 × AP-189B Digital Manometer1 × Protective Carrying Case1 × Small Screwdriver2 × AAA Batteries1 × Multilingual User Manual

• 【High Accuracy & Wide Range】Professional-grade differential pressure gauge with ±30psi measuring range and ±0.3%FSO accuracy at 25°C. Features ±0.25% repeatability and ±0.1%FSO linearity/hysteresis for reliable readings in HVAC, gas pipeline, and ventilation applications. Over-range protection up to 30psi prevents sensor damage.
• 【11 Selectable Pressure Units】Instantly switch between 11 units: psi, kPa, kgf/cm², oz/in², bar, mbar, inHg, mmHg, inH₂O, ftH₂O, and cmH₂O. Covers all common pressure measurement needs for HVAC technicians, maintenance engineers, and researchers without manual conversion.
• 【Data Recording & Analysis】Built-in recording mode captures MAX, MIN, and AVG values during measurement sessions for easy data analysis. One-touch zero setting ensures accurate baseline readings before each test. Data Hold function freezes readings for convenient recording.
• 【Multi-Function LCD Display】Large backlit LCD screen ensures clear visibility in dim environments. Features low battery indicator, auto power-off (25min), and differential pressure (DIF) mode. Compact handheld design (160×62×31mm) fits easily in tool bags for on-site jobs.
• 【Complete Kit Ready to Use】Includes AP-189B manometer, protective carrying , small screwdriver, 2×AAA batteries, and multilingual user manual. Ideal for HVAC system calibration, natural gas pressure testing, ventilation troubleshooting, and appliance installation.