The Hewlett Packard 7835x ECG Unit describes a series of multi-parameter monitors. These can be configured with one or more of the following: SAO2, NIBP, and/or invasive blood pressure. ECG is a standard parameter. Printers are optional (Image shown with optional printer). This series includes, but is not limited to, models 78352C, 78353A, 78354A, and 78354C. DRE sells the HP 7835x series monitors refurbished.