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 2～1388KΩ 2:tolerance of resistance:±1%,±2.5%,±5%,±10% 3:B value: 25/85=3420～4557K 4:tolerance of B value: ±1%,±2%,±3% 5:operating temperature: -30°C~350°C Application: temperature testing and temperature controlling in domestic electronic appliances, such as micro-wave ovens, water boiler, electronic heaters.