tender for 70 degree single crystal 2 mhz probe (backward & forward), along with roller with potted cablesuitable for digital ultrasonic double rail testers model no.railscan-200w of modsonic make. specification:-suitable for digital ultrasonic double rail tester model no.railscan-200w of modosonic make as per rdsospecification no.m&c/ndt/130/2007 rev -l aug-2014. drawing as per usfd-2012.accepted offer-modsonic.