The NCT I was produced from the mid 1970's until it was replaced by the NCT II around 1980.
The NCT II was the industry standard until the appearance of the Xpert in the late 1980's.
Tek-Net can still service and calibrate both of these instruments. Our extensive NCT parts inventory ensures that we can keep your intrument functioning for as long as you want it to. Please contact us if you have any questions or if you wish to arrange for a loaner instrument.