Features: 1:high testing precision 2:small and quick in reaction 3:long and good service 4:good interconvertibility and consistency Specification: 1:resistance: R25 0.1～1000KΩ 2:tolerance of resistance:±1%,±2%, 3%,5%,10% 3:B value: 25/50=1960～4480K 4:tolerance of B value: ±0.5%,±1%,±2% 5:operating temperature: -30°C~350°C Application: Temperature testing and temperature controlling in domestic electronic appliances, such as air-conditioner, micro-wave oven, heater and so on.