Freon leak detectors trigger on R22, R134A, R404a, R410A and all halogenated refrigerants (including , , HCFC and mixtures).<br> Audible and visual gas leak indicator and dual battery indicator.<br> react to all halogenation. This includes but is not limited to:<br> After rotating the switch, the detector is ready for use.<br> 1-7 level selectable sensitivity<br> Response time: 3s<br> Working temperature: 0℃-52℃ (30℉ to 125℉)<br> The highest sensitivity to all halogenated refrigerants: 0.21oz/yr<br> Battery life: about 50 hours of normal use<br> Operation mode: continuous and unlimited<br> Fixed probe length: 7.87 (in)<br> Dimensions: 1.37 x 1.37 x 5.90 inches<br> Warm-up time: about 6 seconds<br> Reset time: two to ten seconds<br> Power supply: 6V DC, 4 AAA alkaline batteries. (not include)<br> The Freon tester comes with UV lamp + white flashlight. UV lamp is used with fluorescent agent, white light is suitable for illuminating dark and small places.(LED light contains battery)<br> Colour: Black+Yellow<br> Material: ABS<br> Package Contents:<br> 1 x Halogen leak detector<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.