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 0.1～500KΩ 2:tolerance of resistance:±1%,±2%,±3%,±5%,±10% 3:B value: 25/50=1960～4480K 4:tolerance of B value: ±1%,±2%,±3% 5:operating temperature:-20°C~180°C Application: air-conditioner, heating facilities, electronic thermometer, electronic table-calendar and automobile electronics.