Pressure Gauge Simulator

This pressure gauge simulator is a free online tool for practising how to read a pressure gauge with a Bourdon tube dial display. Covering 0–100 PSI with a 2 PSI least count, the simulator shows a dual-scale analogue gauge reading in PSI, BAR, and kPa simultaneously. It is designed for engineering students, pneumatics and hydraulics trainees, automotive technology learners, and HVAC technicians who need to develop accurate analogue gauge reading skills. The simulator includes practice exercises and a timed quiz for exam preparation.

The simulator opens in Simulate mode with the needle set to a default pressure. To begin:

• Click and drag the needle around the dial to set any pressure from 0 to 100 PSI. You can also use arrow keys or the scroll wheel for 2 PSI increments.
• The info row below the gauge shows the reading in three units: PSI, BAR, and kPa.
• The formula panel displays live unit conversions: 1 BAR = 14.504 PSI = 100 kPa.
• Use the Zoom button to magnify the dial face for reading between graduation marks.

In Simulate mode the needle moves freely around the Bourdon tube gauge dial. The gauge face displays major and minor divisions — each minor division equals the least count of 2 PSI. As you move the needle, the conversion panel calculates the equivalent BAR and kPa values in real time. This mode helps you become comfortable with reading analogue dials, interpolating between graduation marks, and recognising the relationship between PSI, BAR, and kPa. Understanding dual-scale gauges is a critical competency in pneumatics, fluid power, and process instrumentation.

Practice mode: The needle is set to a random pressure and locked. Your task is to read the PSI value from the gauge dial and type it into the input box. Click Check for instant feedback. Click New for another random reading. Your running score is tracked.

Quiz mode: A timed series of 5 pressure readings tests your gauge reading speed and accuracy. After all questions, a results panel shows your score, star rating, and a per-question breakdown with correct answers.

This simulator reinforces the three most common pressure units used in industry:

• PSI (pounds per square inch): Common in the US and in tyre pressure, hydraulic systems, and compressed air.
• BAR: Widely used in Europe and industrial settings. 1 BAR = 14.504 PSI.
• kPa (kilopascals): The SI-derived unit. 1 BAR = 100 kPa exactly.

Being able to convert between units quickly is essential for reading dual-scale gauges found on compressors, boilers, and hydraulic test benches.

• On a real gauge, read the needle from directly in front to avoid parallax error — many industrial gauges have a mirror band on the dial to help with alignment.
• Count the number of minor divisions between two major marks to confirm the resolution before reading — never assume all gauges have the same least count.
• For fluctuating pressures, use a gauge with a liquid-filled (glycerine) case to dampen needle vibration and get a stable reading.
• Always verify the gauge is zeroed at atmospheric pressure (no load) before taking measurements to ensure accuracy.