How do I fix my Testo 550 gauges? The low side won't go below this. No leaks. : r/HVAC
Amazon.com: Testo 550s AC Manifold Gauge Set – Manifold Gauges Hvac and Refrigeration – Incl. 2 Wired Temperature Clamp Probes – AC Recharge Kit with superheat, subcooling with Bluetooth : Industrial & Scientific
Testo 550s Smart Kit - Digital Manifold with 2 Way Valve, 115i Temp Probes (x2), 552i Vacuum Probe (Part Number 0564 5504 01) | TEquipment
Testo 550S Refrigeration Vacuum Gauge Digital Manifold Kit Air Conditioning for Refrigeration Vacuum Pressure Temperature Tester