JB Industries LD-5000 Prowler Refrigerant Leak Detector Extremely accurate for all HFC, HCFC and blended refrigerants as well as new HFO refrigerants Leak indicator bar graph, audible alert and vibration in handle - Sensor life tested to be greater than 10 years, unique in the industry Safe to use in combustible atmospheres - Audible alarm can be muted Extremely long sensor life and electrochemical function of sensor life does not diminish over time or with use Sensitivity can be programmed to high, medium, low