diodes, laboratory colorimeters, fast recovery diodes, power diodes, rectifier diodes, schottky diodes, conductivity meters, laboratory ph meters, microbial colony counters, ph meters, laboratory testing flame photometers, silicon controlled rectifiers (scr), laboratory testing spectrophotometers, stud zener diodes, colorimeters, digital conductivity meters, portable ph meters available from naina semiconductor ltd based in new delhi, delhi. click the links below to visit our website or contact us via our profile page.