Flying probe testers work by In-circuit testing the board via a number of moving test probes. They have the advantage over traditional In-circuit testers of not requiring a dedicated "bed of nails" test fixture thus reducing the price for each different board being tested. However, modern Flying Prober testers offer so much more than just In-circuit testing. They enable the user to combine In-circuit, AOI, Functional, Device Programming and Boundary Scan testing, in one test system.
Terotest sells a range of Flying probe testers designed to cater for all budgets and test requirements.