The ultrasound has not been tested further than powering it on and plugging in the probes. You can also see in the pictures that the gain is turned all the way up and then all the way down for esch of the probes. If you need more testing done adn we can help then we would be glad to do that. It does have some cosmetic wear on it so please browse the pictures.. ask any quesitions you need to befor purchasing the equipment.