Elitech ILD-300 Advanced Refrigerant Leak Detector NDIR Sensor Freon Gas Detector. Elitech ILD-300. The Elitech ILD-300 features advanced NDIR (Non-Dispersive Infrared) sensor technology that detects even the most difficult refrigerants like R-134a, R-404A, R-407C, R-410A and 1234yf with ultra-sensitive precision.
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