In most cases, Presto creates a hardware solution that is built into the load board so that a standard tester could be used rather than having to buy and charge the customer for a highly specialised tester. Test costs are based on the time that a tester is used so that the small additional costs of components on a load board is significantly more cost effective than moving to a higher feature or specialised tester.
An example of adapting standard test equipment to outperform is for ultra-low current testing. By adding a current amplifier onto the load board, a standard tester can now be used to measure currents as low as one nanoAmp. Similarly, a customer needed 6.5 GHz testing but standard testers only handle up to 6 GHz. A tester that could handle up to 12 GHz is much more expensive.