supply of double crystal transducer for normal beam scanning, 4mhz , (1)double crystal transducer for normal beam scanning, 4mhz, 15 mm round crystal dia. (including connecting cable of two meter length - bnc sockets), qty. 01 no. ; (2) double crystal transd ucer for normal beam scanning, 4mhz, 20 mm round crystal dia. (including connecting cable of two met er length - bnc sockets), qty. 01 no. matl.& specn -- rdso/lkos letter no. mc/wa/failure dt. 11.05.2 023 and rdso/lkos specification: rdso/m&c/ndt/116/2000 (rev. 2/ october 2020). [ warranty peri od: 6 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]