Product Overview:
Upgrade your toolkit with our advanced Digital Differential Pressure Gauges. This listing offers a choice between two professional-grade models: the feature-rich QX-1201 and the compact, cost-effective 189A. Perfect for HVAC technicians, facility engineers, and maintenance professionals, these tools provide precise measurements for differential pressure, positive pressure, and negative pressure in various units. Whether you're troubleshooting, installing, or calibrating systems, you can select the model that best fits your technical needs and budget.
Key Features & Benefits:
Dual-Port & Single-Port Design: The QX-1201 features two tube connectors (+, -) for direct differential measurement. The 189A uses a single quick-connect port, calculating differential pressure against ambient air or between two points sequentially.
Wide Range of Units: Measure in psi, kPa, inH₂O, bar, mbar, mmHg, inHg, and more with a simple button press.
Data Recording & Hold: Both models allow you to freeze readings (HOLD) and record data. The QX-1201 stores up to 100 data points, while the 189A tracks Max/Min/Average values in recording mode.
Advanced Functions: Features like Zero Reset, MAX/MIN mode, and Differential (DIF) mode make complex measurements simple.
Clear LCD Display: Easy-to-read screen with backlight for working in low-light conditions.
Portable & Durable: Both are lightweight, handheld, and designed for use in tough field environments.
| Model | QX-1201 | 189A |
| Measurement type | Single-tube gauge pressure / Dual-tube differential pressure | Differential pressure, positive pressure, negative pressure |
| Pressure unit | kPa, psi, bar, mbar, Pa, inHg, mmHg, inH₂O, ftH₂O, cmH₂O, kg/cm², oz/in² | inH₂O, psi, bar, mbar, kPa, inHg, mmHg, oz/in², ftH₂O, cmH₂O, kg/cm² |
| Measuring range | kPa: ±20.68 psi: ±2.999 | kPa: ±13.79 psi: ±2.000 |
| Resolution | kPa: 0.001 mmHg: 0.1 | kPa: 0.01 mmHg: 0.1 |
| Accuracy | ±0.3% FSO (Full scale) | ±0.3% FS (Full scale) |
| Linear/Hysteresis | ±0.29% FSO | ±0.1% FS |
| Repeatability | ±0.2%（MAX±0.5% FSO） | ±0.25% FS |
| Response time | 0.5 s | 0.5 s |
| Maximum pressure rating | 2.999 Psi | 6 Psi |
| Overload indication | Err 0 (Over range) | Err1 (Exceeding the maximum) |
| Underload indication | Err 1(below range) | Err2 (below minimum) |
| Operating temperature | 0°C ~ 50°C | 0°C ~ 40°C |
| Storage temperature | -10°C ~ 60°C | -10°C ~ 60°C |
| Power supply | 9V (include) | 2* AAA (not include) |
| Auto power-off | 15 minutes of inactivity | Approximately 25 minutes (can be disabled) |
| Weight | 200g | 134g |
| Size | 164×70×32mm | 160×62×31mm |
| Data storage | Support (100 sets) | Support (recording mode, view maximum/minimum/average values) |
| Backlight function | Yes | With (30-second auto-off) |
| Zero reset function | Press and hold for 2 seconds | Press and hold for 5 seconds |
| Differential pressure mode | Support (DIF button) | Support (DIF button) |
| Maximum/minimum value recording | Support (MAX button) | Supported (viewable in REC mode) |
| Pressure interface | Positive and negative pressure pipe connections (2) | Positive and negative pressure pipe connections (2) |
What’s in the Box?
1 x Digital Pressure Gauge (QX-1201 OR 189A as selected)
1 x User Manual
