Tender For supply of graphite disc electrode specification spl grade to agksp with ultra f purity size 0.492 inch x od x 0.125 inch id x 0.2 inch width max. allowable spot impurities per element - 1ppm and total max allowable spot impurities - 5ppm for oil spectrometer, make: gnr, italy and model: rotoroilmake/brand: gnr or similar compatible to gnr oil spectrometer, model: rotoroil.