This standard resistor series is of oil based resistance standard are designed for high accuracy resistance. These resistance can carry comparatively large currents without being heated. The resistances are immersed in moisture free and non-corrosive oil contained in metal vessels. Manganin coil is used which are thoroughly aged. Silver soldered connections are used. Standard resistances  of  0.01,  0.1 ,  1  and  10 ohms are provided with 4 terminals.