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Product Features
  • testo 312-4 differential pressure gauge
  • testo 312-4 hose set
  • balloon pump with release screw
  • conical test plug 1/2
  • conical test plug 3/4
  • testo fast printer
  • pressure set for gas pressure measurements in heating systems
  • system case
Delivery options

At Cadmus Products we aim to deliver orders efficiently and at highly competitive rates. 

  • We can ship consignments of all shapes and sizes and hazardous content across the UK and worldwide. Most of our orders are sent via DHL, however sometimes we may use other couriers.
  • If you are purchasing a laboratory product online you can find out the price of shipping checkout. If you are obtaining a quote for a product, then we will email you
    with our best shipping prices along with your quote.
  • Please see our delivery page for full information

testo 312-4 Differential Pressure Meter (Basic Set)

A variety of directives describe the tests which have to be carried out before commissioning water and gas pipes. The testo 312-4 differential pressure measuring instrument offers measuring processes for load and tightness tests as well as serviceability tests on gas pipes using air. It also enables the checking of static gas and gas flow pressures, as well as the nozzle pressure setting on gas burners or boilers.

  • Tightness and serviceability testing by pressure drop on gas pipes in accordance with DVGW TRGI 2008
  • Load testing on gas pipes in accordance with DVGW-TRGI 2008 using our high-pressure probe (can be ordered as an option)
  • Pressure testing on drinking water pipes using water and with the support of the optional high-pressure probe in accordance with DIN 1988 (TRWI) and using air in accordance with the ZVSHK information sheet
  • Pressure testing on waste water pipes using our high-pressure probe (can be ordered as an option)
  • Checking the gas pressure regulator by recording the readings over a defined period (max. 25,000 readings)
  • Checking the gas connection and gas flow pressure, as well as setting the nozzle pressure on gas burners and boilers
The testo 312-4 pressure measuring instrument offers a high level of operating convenience in order for you to carry out pressure measurement efficiently - for instance through preset measuring processes or the clear presentation of readings on the large display. The included testo fast printer means you can produce measurement data printouts directly on site. The easyheat PC software is available to you as an option for data transfer and evaluation. Furthermore, probes which are also available for various measuring tasks can be attached to the differential pressure meter (e.g. high-pressure probe or thermocouple probe for temperature measurement).
Temperature - TC Type K (NiCr-Ni)

Measuring range

dependent on probe type used


±0.4 °C (-100 to +200 °C) *

±1 °C (Remaining Range) *

*Accuracy information applies only to instrument without probes connected

Differential pressure (internal sensor)

Measuring range

0 to +200 hPa


±0.03 hPa (0 to +3 hPa)

±1.5 % of mv (+3.1 to +40 hPa)

±2 hPa or ±1 % of fsv (41 to +200 hPa)


0.01 hPa

Pressure measurement (external probe)

Measuring range

0 to +25 bar


±0.6 % of fsv (0 to +25 bar)

±0.6 % of fsv (>+10 to +25 bar


10 hPa

General technical data


219 x 68 x 50 mm

Interface printer

Infrared interface

Data transfer


PC software



25,000 measuring values


600 g

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