This type of cup has been in popular use for many years and conforms to IS 3944 1965 specification. These are available in following sizes: Jet No.B-1,B-2,B-3 &B-6. Flow cup viscometer deep for 4 viscometer with digital Temp. Indicator & controller. Spare brass cup with any size jet deep for 6 viscometer with Digital Temp. Indicator & controller.