Find that frustrating air conditioner leak with this HDE portable halogen gas leak detector tool. This refrigerant leak detector has an adjustable sensitivity and automatic detection mode. It warms up in six seconds, and it sounds an alarm when halogen gases are detected. The 17-inch probe is flexible, allowing it to reach tight spaces. It uses four AAA batteries for power for about 0 hours of running time. A light emitting diode indicator shows when its battery life is low.