We are offering pn junction diode. pn junction diode / semiconductor diode characteristics apparatus with regulated power supplies objective : to study forward& reverse characteristics of pn junction diode. features : instrument comprises of dc regulated power supplies 0-3vdc/150ma & 0-30 vdc/150ma, through selector switch. two dual range square meters for voltage & current observations, two pn junction diodes mounted behind the panel for forward and reverse experiments, connections of supplies, meters & diodes brought out at 4 mm sockets.