ZLLJYBLG GL77A Halogen Leak Detector – Ultra-Sensitive Freon Sniffer for HVAC, Auto AC, R134a/R410a

Ultra-responsive refrigerant leak detection for professionals

The GL77A Halogen Refrigerant Leak Detector combines an ultra-sensitive semiconductor sensor with dual detection technology to catch even tiny leaks across HVAC systems, automotive A/C, refrigerators, and cold storage. It delivers real-time readings from 0 to 1000 PPM on a large backlit LCD, helping you assess leakage levels at a glance without guesswork. The device emphasizes practical, actionable information—for technicians and DIYers alike—while keeping the process approachable and efficient.

Key capabilities

• Ultra-High Sensitivity with a fast 0.5 second response, enabling quick leak confirmation and follow-up checks.
• Real-time concentration readout from 0 to 1000 PPM for precise monitoring during service calls.
• Noteworthy sensitivity of 0.14 oz/year (approximately 4 g/year), designed to detect even small changes in refrigerant levels.

Design that reaches where others can’t

The 30 cm flexible probe can bend up to 180 degrees, allowing access to tight spaces in HVAC units, car A/C lines, refrigerators, and cold storage compartments. The probe is wrapped in a durable PVC sleeve for long-term resistance to corrosion, while the porous airway design protects the sensors from debris and extends service life in demanding environments.

Smart alerts and simple operation

• Customizable threshold alarm with up and down controls to tailor alerts to your workflow.
• Clear audible and visual alarms paired with screen warnings to minimize missed leaks.
• Automatic power-off to conserve battery life and a straightforward one-button C/F switch for quick readings.

Versatility across refrigerants and applications

Works with halogen refrigerants including R134a, R22, R32, R410a, and more, making the GL77A a versatile tool for technicians and DIY enthusiasts. It suits HVAC service, automotive A/C repairs, refrigerator and cold storage inspections, and industrial refrigeration testing.

Reliability and usability

Strong anti-interference technology helps maintain accurate readings in busy environments. A built-in UV light provides real-time visualization for easier leak localization while the ergonomic handheld design supports comfortable use during extended inspections.