Chauvin Arnoux CA 1860 [P01651815] Single Laser Infrared Thermometer, - 35 °C to + 450 °C (- 31 °F ~ + 842 °F). CA 1860 IR thermometer. To locate all the areas of overheating in just a few seconds, this ergonomic thermometers has been specially designed to be particularly simple to use. The pistol-shaped casing also makes them exceptionally comfortable to handle. All the functions are accessible with just one hand. Due to the laser sight and its flexible use, users can point at the centre of any target without any possibility of error. The results are then displayed on the backlit LCD screen.