Ultraviolet Minipeeper Flame Detector, For Use on Coal, Gas and Oil Fired Burners, Nema 3 and Nema 4 Rated, Integral Nut for 1 Inch Sighting Pipe Mounting, 72 Inch Lead Length, 0/250 Degree Ambient Temperature Rating, Includes 600 Degree Leads

20K Ohm NTC Temperature Sensor, Duct Application, 6 Inch Insertion Length, -40/250 Degree Operating Temperature Range, 20k Ohm NTC @ 77 Degrees, Used with Excel 10,50,80,100,500 Series

20K Ohm NTC Temperature Sensor, Duct Application, Plastic Enclosure, 12 Inch Insertion Length, -40/250 Degree Operating Temperature Range, 20k Ohm NTC @ 77 Degrees, Used with Excel 10,50,80,100,500 Series

20K Ohm NTC Temperature Sensor, Duct Application, 18 Inch Insertion Length, -40/250 Degree Operating Temperature Range, 20k Ohm NTC @ 77 Degrees, Used with Excel 10,50,80,100,500 Series