The LT-651A Digital Manifold Gauge is a digital HVAC/Refrigeration manifold gauge set used for measuring pressures and temperatures in air conditioning and refrigeration systems. It’s a modern digital alternative to traditional analog gauges, designed to give you more precise readings and additional features for servicing HVAC and refrigeration equipment.
Digital pressure & temperature display — shows accurate readings on an LCD screen.
Bluetooth connectivity — pairs with a smartphone or tablet (via an app) for remote monitoring and data logging.
Supports many refrigerants — includes a built-in database compatible with about 89 refrigerant types (R11, R22, R134a, R410A, R290, R1234yf, CO₂/R744, ammonia/R717, etc.).
Superheat & Subcooling — the gauge can automatically calculate superheat and subcooling when temperature clamps are used.
Multiple units of measure — you can switch pressure units (PSI, kPa, bar, inHg) and temperature (°C/°F).
Wide measurement ranges:
Pressure: ~0–6000 kPa gauge (with overload limit up to ~10,000 kPa).
Temperature: about –40 °C to 150 °C (–40 °F to 302 °F).
Rugged construction — built with durable plastics and a user-friendly silicone design.
This digital manifold gauge set is typically used by HVAC technicians and refrigeration professionals to:
Measure high- and low-side pressures in AC and refrigeration systems
Monitor system temperatures
Diagnose issues like improper refrigerant charge
Perform vacuum and charging tasks
Enhance service reporting via Bluetooth data logging