The Extech Instruments Resistance Decade Box is a calibrated device used for circuit testing and calibration. It features seven decades of resistance ranges from 1 ohm to over 11 megaohms, with resistance steps of 1 ohm. The device includes slide switches for easy adjustment of resistance values and three binding posts for secure connections. It has an internal resistance of 0.3 ohms and is powered by 0.3W resistors. The accuracy is ±1%, and it operates within a temperature range of 0°C to 50°C. The compact dimensions are 5.79 x 4.61 x 1.3 inches (14.7 x 11.7 x 3.3 cm), weighing approximately 0.69 pounds (312 grams). The case can be grounded separately. It is ideal for test and measurement applications, allowing precise substitution of components in circuits for testing and calibration purposes.