ZLLJYBLG GL77A Halogen Refrigerant Leak Detector — 0–1000 PPM Backlit LCD, 30cm Flexible Probe

The ZLLJYBLG GL77A is a compact, high-sensitivity halogen refrigerant leak detector that finds tiny Freon leaks quickly and shows real-time PPM concentration on a backlit LCD.

This handheld GL77A combines semiconductor sensing, diode heating induction and UV detection to deliver fast, reliable leak location across a broad range of halogen refrigerants (R134a, R410a, R22, R32 and more). Designed for professional technicians and informed DIYers, it balances sensitivity, reach and ease-of-use with a durable bendable probe and configurable alarm thresholds so you can pinpoint leaks in HVAC systems, vehicle air conditioners, refrigerators and cold storage without guesswork.

How fast and sensitive is this detector?

The GL77A offers industry-leading sensitivity and near-instant response so you detect even the smallest leaks. It reports real-time concentration values from 0 to 1000 PPM and reacts in as little as 0.5 seconds for immediate feedback.

• Maximum reported sensitivity: 0.14 oz/yr (≈4 g/yr).
• Response time: typically 0.5 seconds; visual and audible alarms activate on threshold exceedance.
• PPM readout: numeric display on large backlit LCD for precise monitoring.

Can it reach tight or awkward locations?

Yes — the GL77A includes a 30 cm (11.8 in) flexible probe that bends up to 180° so you can inspect confined spaces and hidden joints without disassembling systems. The probe is protected with a PVC sleeve and a porous airway design to prolong sensor life in harsh environments.

• 30 cm ultra-long probe bends 180° for tight-access work.
• Durable PVC sleeve resists corrosion and wear.
• Porous airway protects internal sensors from contaminants.

How do alarms and controls help avoid false positives?

You can set a custom alarm threshold using the SEL button and adjust it up or down to match inspection requirements, reducing unnecessary alerts. When concentration exceeds your set level the unit triggers audible and visual alarms and displays concentration on-screen for confirmation.

• Customizable alarm threshold via long-press SEL and up/down adjustment.
• Multi-mode alerts: sound, light and on-screen visual warning.
• Automatic power-off preserves battery life between jobs.

Which refrigerants and jobs is the GL77A suited for?

This detector is engineered for halogen-based refrigerants, making it a practical tool across HVAC maintenance, automotive AC repair, refrigeration troubleshooting and industrial cold storage inspection. Strong anti-interference circuitry helps maintain accurate readings in complex field conditions.

• Compatible refrigerants include R134a, R410a, R22, R32 and other halogens.
• Useful for HVAC systems, car AC, refrigerators, cold rooms and industrial units.
• One-button ℃/℉ switch and simple control layout for fast field use.

Who is this for? The ZLLJYBLG GL77A is intended for HVAC technicians, automotive service professionals and advanced DIYers who need a portable, sensitive detector to locate halogen refrigerant leaks quickly and accurately. It’s also appropriate for maintenance teams in facilities with refrigeration equipment who require durable probes, clear PPM readouts and configurable alarms to speed diagnostics and reduce downtime.