testo 558s L Heat Pump Professional Set - App-controlled with Vacuum, Pressure, Temperature

Measure pressure from -1 to 60 bar with ±0.5 % FS accuracy and vacuum down to 0 micron, all monitored via Bluetooth 5.0 and the Testo Smart App.

Overview

The Testo 558s L Heat Pump Professional Set combines a digital manifold with wireless clamp thermometers and a vacuum probe for complete commissioning, service, and maintenance of heat pump and refrigeration systems. The manifold features a graphic LCD display, 90 refrigerant profiles updateable via the app, and automatic calculation of superheating and subcooling. Data logging and report generation are handled through the Testo Smart App on iOS or Android devices.

What stands out

• Wireless connectivity: Bluetooth 5.0 links the manifold, clamp thermometers, and vacuum probe to your smartphone or tablet.
• Comprehensive measurement: pressure, temperature, and vacuum in one system, with heat pump mode and leak test functions.
• Long battery life: up to 150 hours from four AA batteries, with USB-C external power option.
• Rugged design: IP54 protection for the manifold, suitable for field use.

Technical details

• Pressure range: -1 to 60 bar, resolution 0.01 bar, accuracy ±0.5 % FS.
• Temperature range (NTC): -50 to +150 °C, accuracy ±0.5 °C (0 to 60 °C).
• Vacuum range: 0 to 20000 micron.
• Refrigerant profiles: 90, updateable via Testo Smart App.
• Hose connections: 3 x 7/16" – UNF (1/4" SAE).
• Included wireless probes: 2 x Testo 115i clamp thermometers, 1 x Testo 552i vacuum probe.
• Operating temperature: -10 to +50 °C.
• Power: 4 x AA batteries or USB-C external supply.

Our verdict

A complete, app-driven solution for heat pump professionals, delivering precise measurements and wireless convenience in a rugged package.