Testo 552 Digital Vacuum Gauge

The Testo 552 Digital Vacuum Gauge helps engineers check deep vacuum levels in refrigeration, air conditioning, and heat pump systems. It delivers reliable readings during evacuation work and helps confirm that moisture and unwanted gases have been removed. Its maintenance-free sensor design reduces downtime and supports consistent performance in the field.

Designed for daily service work, the Testo 552 Digital Vacuum Gauge combines accuracy with simple operation. The large backlit display remains easy to read in poor lighting conditions, while the fold-out hook allows hands-free positioning during testing. Bluetooth connectivity also makes it easy to view readings on a compatible mobile device.

Reliable Vacuum Measurement

Precise vacuum readings help engineers commission and service HVACR systems with confidence. The Testo 552 Digital Vacuum Gauge measures from 0 to 20,000 microns and delivers resolution down to 10 microns, depending on the measurement range. Its integrated absolute pressure sensor resists contamination, so users can maintain accuracy without routine sensor cleaning.

The optical alarm notifies users immediately when readings exceed preset limits. This helps engineers monitor system performance more efficiently and complete checks with greater confidence. In addition, the Testo 552 Digital Vacuum Gauge measures both evaporation and ambient temperatures, providing valuable data during servicing and commissioning tasks.

Built for Field Use

Durability is important on busy job sites, and this gauge is designed with that in mind. Its IP42 protection rating helps resist dust and water ingress, while overload protection adds an extra level of safety during operation. The rugged housing is suitable for demanding service environments.

Two set options are available, allowing users to choose the package that best suits their requirements. With up to 2400 hours of battery life from two AA batteries and direct compatibility with the Testo 570 digital manifold, the Testo 552 Digital Vacuum Gauge offers a practical solution for professional HVACR applications.

Key Features

Maintenance-free absolute pressure sensor
Bluetooth communication with the Testo Smart Probes App
Backlit display for improved visibility
Optical alarm indication when limits are exceeded
Measures evaporation temperature data
Measures ambient temperature data
Fold-out hook for hands-free operation
Compatible with the Testo 570 digital manifold
Rugged construction for field service work
Sensor design resists contamination effects
Suitable for refrigeration system evacuation checks
Suitable for air conditioning service applications
Suitable for heat pump commissioning tasks
Available in two different set configurations

Technical Specifications

Manufacturer	Testo
Product	Testo 552 Digital Vacuum Gauge
Manufacturer Part Code	0560 5522 / 0560 5521 depending on set supplied
Measuring Range	0 to +26.66 mbar / 0 to 20,000 microns
Vacuum Measuring Range	1100 to 0 mbar / 825080 to 0 micron
Accuracy	±10 microns plus 10% of measured value from 100 to 1000 microns
Accuracy at Low Range	0 to 1.33 hPa / 0 to 1000 micron up to ±10 micron
Remaining Range Accuracy	±0.3% FS
Vacuum Resolution	1 to 5000 microns depending on range
Resolution	0.01 hPa / 10 micron
Sensor Type	Pirani sensor with absolute pressure measurement
Measuring Cycle	0.5 seconds
Overload Protection	6 bar / 87 psia absolute and 5 bar / 72 psig relative
Operating Temperature	-20°C to +50°C
Storage Temperature	-20°C to +50°C
Battery Type	2 x AA batteries
Battery Life	Up to 2400 hours, approximately 130 hours with backlight active
Protection Rating	IP42
Connections	2 x 1/4″ SAE (7/16″ UNF) and 1 x Mini-DIN
Bluetooth Version	Bluetooth 4.0
Displayed Units	mmHg, Torr, mbar, hPa, micron, inH₂O, inHg, Pa
App Compatibility	iOS 8.3+ and Android 4.3+ via Testo Smart Probes App
Dimensions	250 x 165 x 55 mm
Weight	Approximately 500 g
Warranty	2 Years

Comparison Table

Feature	Set Type 1	Set Type 2
Manufacturer Part Code	0560 5521	0560 5522
Vacuum Measurement	0 to 20,000 microns	0 to 20,000 microns
Sensor Type	Absolute pressure sensor	Absolute pressure sensor
Bluetooth Connectivity	Yes	Yes
IP Rating	IP42	IP42
Battery Type	2 x AA batteries	2 x AA batteries
Battery Life	Up to 2400 hours	Up to 2400 hours
Warranty	2 Years	2 Years