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Extech’s new RD300 detects all existing refrigerants used in various air-conditioning, cooling, and refrigeration systems. Designed to increase reliability in the field, the replaceable sensor tip has a built-in LED light with on/off switch to provide illumination in dimly lit areas. High/medium/low sensitivity modes enhance accuracy, audible alerts (with mute button) and visual alarms reduce missed detections, and the low battery indicator enhances reliability on jobsites, according to company officials.