Remote Bulb Sensor, Differential 3 to 10 Between Switches each Switch is Fixed @ 3 Degrees Fahrenheit, Switch Action Two SPDT Switches Operating in Sequence, Right Switch Breaks R-B and makes R-W @ Setpoint on a Temperature Rise, Left Switch Breaks R-B and makes R-W if Temperature Continues to Rise thru Interstage Differential, Maximum 125 Degrees Fahrenheit, Range 0 to 100 Degrees Fahrenheit, Bulb Size 1/2 x 4 3/16 Inches, Capillary Length 20 Feet, Height 5 5/8 Inches, Width 2 Inches