Testo digital manifold gauge kit for HVAC — 550s Bluetooth with 2 wired clamp probes, superheat/subcooling

The Testo 550s is a professional-grade digital manifold gauge kit that measures pressure and temperature, calculates superheat and subcooling, and transmits data via Bluetooth for efficient HVAC and refrigeration diagnostics.

Compact and rugged, the Testo 550s combines high-precision sensors with wireless connectivity to speed up on-site troubleshooting and reporting. It pairs the accuracy HVAC technicians expect—wide pressure and temperature ranges, tight tolerances—with the convenience of data transfer to the Testo Smart App. The unit supports a broad selection of refrigerants, including modern A2L types, and is designed for daily use in demanding environments.

How does the Testo 550s measure pressure and temperature accurately?

The 550s uses calibrated pressure sensors and temperature probes to deliver reliable readings across a broad span. Pressure accuracy is rated at ±0.5% of full scale and temperature accuracy at ±0.5 °C (±0.9 °F), so measurements are consistent for system diagnostics and documentation.

• Pressure range: -15 to 870 psi (-1 to 60 bar) for low and high-side readings
• Temperature range: -58° to 302°F (-50 to +150°C)
• Accuracy: ±0.5% full-scale pressure; ±0.5 °C temperature
• IP54 protection for jobsite durability

What workflow advantages does Bluetooth and the Testo Smart App provide?

Bluetooth connectivity streams live measurements to the Testo Smart App, enabling remote viewing, calculation, and report creation without returning to the truck. This reduces manual transcription errors and lets you save or share standardized service reports directly from the field.

• Wireless data transfer to smartphone or tablet
• Automatic superheat and subcooling calculations in-app
• Generate, store, and export measurement reports on-site
• Remote operation of measurements for safer, more convenient checks

Which accessories and refrigerants are supported with this kit?

The 550s kit is available with a selection of probes and adapters tailored to HVAC, refrigeration, and heat pump work. It supports most common refrigerants and is compatible with A2L refrigerants, helping you stay current with industry changes.

• Includes two wired temperature clamp probes (kit-dependent accessories may vary)
• Optional vacuum measurement and protective case depending on configuration
• Works with a wide refrigerant library including A2L types
• Built-in calculations for superheat and subcooling specific to refrigerant selected

How durable and portable is the Testo 550s for daily field use?

The 550s is designed for technicians who move between sites: compact dimensions and a rugged casing make it easy to carry while an IP54 rating offers protection from dust and splashes. At roughly 826 g, it balances portability with a robust feel suited to workshop and jobsite environments.

• Dimensions: 210 x 121 x 60 mm (8.27 x 4.76 x 2.36 in)
• Weight: about 29.14 oz (826 g) for handheld convenience
• Operating temperature: -4° to 122°F (-20 to +50°C) for varied climates
• IP54 splash and dust protection for everyday field durability

Who is this for? The Testo 550s is built for HVAC technicians, refrigeration specialists, service contractors, and facilities maintenance teams who need precise, traceable measurements with fast reporting. If you perform regular charging, leak checks, or system optimization on air conditioning, refrigeration systems, or heat pumps—and value digital documentation and compatibility with modern refrigerants—the 550s provides a compact, connected solution to streamline field diagnostics and reporting.