The testo 420 differential pressure measuring instrument is suitable for accurate differential pressure measurement up to 120 Pa, e.g. when checking filters in HVAC systems. Flow velocity and volume flow are calculated by the testo 420. The measuring instrument can also be used for absolute pressure measurement. Differential pressure measuring instrument with practical functions You can use a Pitot tube and compatible connection hoses (both optional) to measure the flow velocity and volume flow in ventilation ducts. Timed and multi-point mean calculation, as well as the combination of the two, along with simple input of the duct geometry provide you with support for measurements in ducts. The automatic zeroing ensures higher accuracy for low pressures. All measuring values are easy to read on the large display which has an illumination function. Documenting the measurement data Measurement data can be stored in the differential pressure measuring instrument for analyses and documentation. It’s easy to manage the measurement data on the PC without any additional software, via the plug & play function. testo 420 differential pressure measuring instrument including batteries and calibration protocol. Customers who viewed this product also viewed Customers who viewed this product also viewed testo 510 set – differential pressure measuring instrument Differential pressure measurement from 0 to 100 hPa  Flow measurement possible with a Pitot tube (available as an option)   : 0563 0510 Customers who viewed this product also viewed testo 420 – Differential pressure measuring instrument Differential pressure measurement, e.g. to check filters in air conditioning and ventilation systems Calculate flow velocity and volume flow using a Pitot tube : 0560 0420 Customers who viewed this product also viewed testo 440 dP – Air velocity and IAQ measuring instrument including differential pressure sensor Intuitive: clearly structured measurement menus for volume flow, K-factor, degree of turbulence, cooling/heating output, mould detection and long-term measurement, such as CO₂ Wireless: Bluetooth® probes for extra convenience when measuring and less cable clutter in the measuring case (please order probes separately) : 0560 4402 Customers who viewed this product also viewed testo 440 delta P Air Flow ComboKit 1 with Bluetooth® Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts or at ventilation outlets​ Smart: simply combine the universal Bluetooth handle with the 100 mm vane or hot wire probe head and the extendable telescope (1.0 m)​ : 0563 4409 Customers who viewed this product also viewed testo 400 – Universal IAQ instrument Smart, intuitive measurement programs including HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD and turbulence as per EN ISO 7730 and ASHRAE 55 High-precision, location-independent and integrated differential pressure sensor : 0560 0400 Customers who viewed this product also viewed testo 400 air flow kit with hot wire probe Standard-compliant determination of the volume flow in ducts using grid measurements as per EN ISO 12599 and ASHRAE 111 Determination of the volume flow at outlets by measuring the reference pressure and entering the manufacturer-specific K-factor : 0563 0400 71 Customers who viewed this product also viewed testo 400 air flow kit with 16 mm vane probe Standard-compliant determination of the volume flow in ducts using grid measurements as per EN ISO 12599 and ASHRAE 111 Determination of the volume flow at outlets by measuring the reference pressure and entering the manufacturer-specific K-factor : 0563 0400 72 Customers who viewed this product also viewed testo 440 delta P Air Flow ComboKit 2 with Bluetooth® Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts, at ventilation outlets Smart: combine the universal Bluetooth handle with the humidity/temperature probe head or extendable telescope (1.0 m). Vane probe heads (Ø 16 mm, Ø 100 mm) can simply be plugged into the telescope : 0563 4410 Customers who viewed this product also viewed testo 512-1 – Digital differential pressure measuring instrument with App connection Simple, fast and precise differential pressure measurement (0 to 200 hPa) for checking filters and for Pitot tube measurement in the ventilation duct Reliable measurement results due to position-independent differential pressure sensor with high accuracy : 0563 1512 Use the testo 420 differential pressure measuring instrument to carry out simple, efficient tests on filters. You can also use the measuring instrument in conjunction with a Pitot tube to measure flow velocity and volume flow really easily in ventilation ducts.