The Fluke 742A resistance standards are portable and rugged precision resistors that provide highly stable and accurate resistance measurements for calibration purposes between 18°C and 28°C. They have excellent temperature stability below 2.5 ppm for 6 months and require no oil baths or other equipment. A range of resistance values between 1 ohm and 19 megohms are available, making them suitable for calibrating devices like the Fluke 5700A and 5720A calibrators.