Specifications: The thermopile is used with 750 millivolt pilot systems. This method is mostly stumbled on on fuel fireplaces and gas logs that use wall switches or remote controls. This kit is one of those cobination sort thermocouple, provides energy for 250/750 millivolt self-generation management systems. a. Internal resistance (25°C), varies with specs and size between 1,500 mΩ and 4,500 mΩ. b. Normal working temperature 700-750°C. c. Connecting type: spiral variety and two-pole plug-in type. d. Length 36 inch Type: Gas Water Heater Parts Material: copper color:picture colour Features: corrosion resistance, high temperature resistanceApplicable gas: pure fuel / liquefied petroleum gasApplication areas: fuel ovens, fuel grills, gasoline boilers, fuel water heaters, etc. Package Contents: five * thermopile Only the above package content, diversified merchandise are usually not included. Note: Light taking pictures and diverse exhibits may cause the colour of the object in the photo somewhat different from the real thing. The size allowed error is +/- 1-3cm. Dear customer, if you want to buy in vast quantities, please contact us, we will supply one other preferential price.