Metal Oxide Resistors, Special Purpose, High Voltage. The ROX is an excellent choice for high voltage systems with the advantage of high wattage and space saving dimensions. Low TCR: ± 200 ppm/°C standard; ± 100 ppm/°C, ± 50 ppm/°C available; non-inductive only available with TC of ± 200 ppm/°C. Tolerance: ± 1 %; ± 2 %; ± 5 %; ± 10 %. High Voltage (up to 45 kV). For oil bath or open air operation. Standard ROX product is coated; optional uncoated version of the ROX product is available on request.