Testo’s digital pressure gauge
The most important use for differential pressure gauges is checking on the performance of a HVAC system. A significant change in pressure measurements is the main indicator of a blocked air filter. If left unserviced, this will eventually reduce how effectively the ventilation, heating or cooling equipment works. Long term it can even cause the system to break down.
- A blocked air filter inside a ventilation system can cause pollutants to leak through the blockage and contribute to increased particulate build up in your indoor space
- Similarly, restricted ventilation air flow can cause indoor air pressure – a restricted air stream sucks more air in from other areas to fill the vacuum.
- In a worst-case scenario, this unbalanced differential air pressure will contribute to the HVAC system breaking down. This will of course have a knock-on effect on IAQ
Testo instruments provide differential pressure switch and pressure loss solutions. From flow measurements in water heaters to filters in air conditioners, there are many instruments to help technicians across a range of HVAC sector businesses
The testo 510 digital gauge set
Testo’s full 510 differential pressure set allows users to perform measurements on a wide range of HVAC systems, from heaters to coolers to buildings’ integrated ventilation system.
The testo 510 set is compactly designed for easy transport and comes equipped with rear-mounted magnets to make hands-free measurement seamless.

Testo’s 400 universal IAQ instrument
This solution is the ultimate asset for any HVAC technician as it can log and collate data on a huge number of factors relative to IAQ and internal comfort.
The end-game for all HVAC checks is to ensure that the system, whatever its function, is contributing to a more comfortable indoor environment.
The testo 400 instrument makes this process easier, allowing users to perform multiple data measurements with the same instrument.
The testo 400 is the ultimate IAQ parameter measurement solution

The testo 420 differential pressure instrument
Testo’s 420 solution is ideal for performing differential pressure loss filter checks.
Users calculate flow velocity and volume flow using the internal Pitot tube, and all measurements are stored in the instrument for future data analysis and documentation.
The large screen display and user-friendly menu guidance make the testo 420 ideal for time-poor technicians.




