FR9010 lightning protection special standard resistor consists of 9 1/2W high precision military grade wire wound resistor series.When the instrument is calibrated, there is no need to change the line for direct shifting. The test is convenient, the highest precision is up to 0.05%, and the long-term stability is good. It is a special standard resistor specially designed by our company.Its resistance value includes 1mΩ, 10mΩ, 100mΩ, 1Ω, 10Ω, 100Ω, 1KΩ, 10KΩ, 100KΩ. It fully meets the range of 10-3~105 as specified in Order No. 31 of the 《Measures for the Administration of Detecting Qualifications of Lightning Protection Devices》. Mainly used for calibration of grounding resistance tester, equipotential tester, etc.