Designed using the Cropico high quality SP1 switch combined with specially selected resistors, the Seaward RH9A-4 high ohm resistance decade box is ideal for the calibration of insulation test sets having a voltage rating up to 5 kV. Housed in a rugged carrying case and possessing 9 decades the RH9A4 covers a range from 1 kilo ohm to 100 Giga ohms and is equally at home in the laboratory workshop or field application. Supplied complete with high voltage test leads 1 metre in length and calibration certificate.