Over-heated components resulted from malfunctions such as overload, short-circuit, poor connection or others may set a product to fire. The glowwire simulates an overloaded resistor, applies heat to the specimen for a short period of time through observation and measurement, the fire-hazard of the specimen can be determined. It is usually used to test plastic & non metallic components in industries such as electrical and electronic components, electrical home appliances, etc.