Foil precision resistors are MIL grade

VPG Model 303337 ultra-high precision military and space-grade resistor provides high-performance current sensing within mission-critical applications. Device produces a highly precise voltage that is directly proportional to measured current levels, with significantly reduced component sensitivity to applied power changes, including PCR and thermal resistance values. Device provides low temperature coefficient of resistance (TCR) of ±5ppm/°C (–55°C to +125°C, at +25°C ref.), for reduced risk of measurement errors due to temperature changes. http://www.vpgsensors.com