买彩票APP有哪些refurbished or reconditioned equipment has been thoroughly tested and comprehensive preventive maintenance has been performed. we perform a safety test, an electrical safety test, an electrical leakage test, a voltage test, and calibration. we replace worn parts (i.e. ultrasound transducers often need their membranes replaced), and always replace internal and external batteries. all of our refurbished or reconditioned equipment is guaranteed to meet the stringent industry standards the fda places on medical devices.