A high accuracy projection type micromanometer is a precision differential pressure measuring instrument designed to measure very low pressures with high resolution and reliability. It operates on the principle of liquid column displacement, where minute pressure differences cause movement of a manometric liquid, which is then optically magnified and projected onto a calibrated screen or scale for precise reading.

Unlike conventional micromanometers, the projection type incorporates an optical projection system that enlarges the meniscus movement many times, significantly reducing human reading errors. This optical amplification allows accurate detection of pressure differences in the range of fractions of mm of water column (mmWC or Pa), making it suitable for laboratory and industrial airflow measurements.

These micromanometers are widely used in aerodynamics laboratories, HVAC testing, wind tunnel experiments, flow measurement setups, and calibration labs. As reported in recent instrumentation and metrology articles (2024–2025), projection-based micromanometers continue to be preferred for reference-grade low-pressure measurements where electronic sensors may suffer from drift or long-term stability issues.

Key Features & Advantages

• Very high accuracy and sensitivity compared to conventional micromanometers

• Reduced human error due to optical magnification

• Excellent long-term stability with minimal calibration drift

• Reliable reference instrument for calibration and research

• No electronic noise or signal drift, purely physical measurement

• Ideal for low-velocity airflow and pressure drop measurements