Flow Meters & Flow Indicators

What do flow meters and flow indicators do?

Flow meters and flow indicators are both instruments used in fluid dynamics, specifically for monitoring and controlling the flow rate of liquids or gases through pipes. However, they serve different purposes and provide different types of information.


  • Type of Fluid: Different flow indicators are designed for different fluids. Ensure the flow indicator you choose is suitable for the specific type of liquid or gas you'll be monitoring.
  • Flow Rate: Some flow indicators are better suited to high flow rates, while others work best with low flow rates. Make sure your chosen flow indicator is appropriate for your expected flow rate range.

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  • System Pressure and Temperature: Consider the operating conditions of your system. Your flow indicator should be able to withstand your system's pressure and temperature ranges.
  • Visual Clarity: The main purpose of a flow indicator is to provide a visual indication of flow. It's important that the flow indicator provides a clear, easy-to-read indication of flow.
  • Materials: Flow indicators should be made of materials resistant to the fluid passing through. This ensures longevity and reliable performance.

Looking for a water flow meter or indicator for your cold finger condensers?

We recommend the Flow Watchman from DWK.


It's the only flow meter you need in the lab, because the Flow Watchman operates efficiently with water flow ranges as low as 100 mL/minute, making it suitable for even the smallest cold finger condensers. Its upper limit exceeds 1 liter/minute, offering a broad range of flow control.


The speed of the device's ball rotation provides a semi-quantitative measure of water flow, offering reliable, real-time data.
This flow meter is lightweight and durable. Its design ensures it operates in any position and does not require auxiliary support, making installation and maintenance straightforward.

Why is it called a cold finger condenser?

This specialized laboratory equipment is used in chemistry for condensation or recondensation of volatile substances. Named for its unique design that resembles a "cold finger," the device essentially consists of a thin tube inserted into a larger outer tube. The inner tube, or "finger," is typically cooled by running a coolant (like cold water or liquid nitrogen) through it, while the outer tube allows vapor to pass over this chilled surface.


With a Flow-Watchman, liquid flow is observable from a distance, making it convenient for multitasking in your lab.

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