Single Crystal Probe 2.5 Mhz Frequencies And 20Mm Dia With Bnc Socket On Top Of Aluminium Casing For Ultrasonic Testing Of Loco, Carriage And Wagons. Rdso Spe Cification No. M&C/Ndt/116/2000. As Per Drg.No. - Specn: - [ Warranty Period: 30 Months After Th E Date Of Delivery ] ]