The testo 557 digital manifold has a 4-way valve block, large backlit display and sight glass. Two NTC thermistor clamp probes provide superior accuracy of simultaneous, real-time superheat and sub-cooling readings. An external vacuum probe provides fast and more reliable evacuation of the system. The wireless Bluetooth / App allows you to view measurement data on your Smartphone or Tablet, enabling you to quickly and conveniently complete and document your job. Then, be able to finalize the documentation and send the reports and invoice via email, right from the job site. In addition to the 60 refrigerant profiles stored in the instrument, the App can also be used to download new refrigerants from the Internet directly into the digital manifold.

• Measures high side / low side pressures and temperatures
• 4-way valve block with 1/4 in. and 3/8 in. ports
• External vacuum probe for faster and more reliable evacuation of the system
• Battery life: 250 hr (without illumination, without Bluetooth, without vacuum probe)
• External vacuum probe
• Bluetooth / App integration for monitoring, report generation, and sending reports and invoices via email (65 feet range)
• Rugged housing with 5 year warranty with registration for reliable testing
• Includes: testo 557 kit, digital manifold with Bluetooth / App; including 2 x NTC temperature clamp probes, external vacuum probe, batteries, case, certificate of conformity, and user's manual.