Specifications: The thermopile is used with 750 millivolt pilot systems. This components is usually discovered on gas fireplaces and fuel logs that use wall switches or remote controls. This package is one of those cobination variety thermocouple, presents strength for 250/750 millivolt self-generation leadership systems. a. Internal resistance (25°C), varies with specifications and length between 1,500 mΩ and 4,500 mΩ. b. Normal working temperature 700-750°C. c. Connecting type: spiral sort and two-pole plug-in type. d. Length 36 inch Type: Gas Water Heater Parts Material: copper color:picture colour Features: corrosion resistance, extreme temperature resistanceApplicable gas: natural gas / liquefied petroleum gasApplication areas: gas ovens, fuel grills, gasoline boilers, fuel water heaters, etc. Package Contents: five * thermopile Only the above package content, other merchandise aren't included. Note: Light shooting and diversified reveals may cause the colour of the thing in the photo barely various from the real thing. The length allowed error is +/- 1-3cm.