supply of 1. normal single crystal probe pr, 2.5 mhz, crystal size: 20 mm dia.2. normal single crystal probe, 1.25 mhz, crystal size: 15mm dia.3. step block (material - steel) of 10 steps from 01 mm to 10 mm. , normal single crystal probe pr, 2.5 mhz, crystal size: 20 mm dia, suitable for modsonic mak e arya 1(r) along with oem certificate. compatible to usfd machine (rdso specn. no. m&c/ndt/125/200 4, rev.- ii, 2007) [ warranty period: 6 months after the date of delivery ] ] , normal single crystal probe, 1.25 mhz, crystal size: 15mm dia, suitable for modsonic make e instein ii (r) & arya 1(r) along with oem certificate. compatible to usfd machine (rdso specn. no. m&c/ ndt/125/2004, rev.- ii, 2007). [ warranty period: 6 months after the date of delivery ] ] , step block (material - steel) of 10 steps from 01 mm to 10 mm used for assessment of dead zone of normal single & double crystal probe along with either nabl or oem calibration certificate. make: m odsonic/eeci or equivalent. [ warranty period: 30 months after the date of delivery ] ]