The Seaward Group 930159 RH9A is designed using the Cropico High Quality SP1 switch combined with specially selected resistors and is ideal for the calibration of insulation test sets with a voltage rating up to 5kV. Housed in a rugged plastic carrying case with up to 9 decades the 930159 RH9A covers the range 1 kΩ to 1 TΩ and is equally at home in the laboratory, workshop or field application.