A selection of probes, from [Jim Williams’] Linear Technology app note 72. It’s not often that we are shown an entirely new class of test equipment here at Hackaday, so it was with some surprise that ...

The new test employs a photoplethysmograph (PPG) finger probe connected to a computer; this measures the respiratory modulation response (RMR)—the blood flow in the finger in response to paced ...

One of the most basic tools for tinkering with electronics is a multimeter. Today, even a cheap meter has capabilities that would have been either very expensive or unobtainable back in the 1970s.

Elastography, in which tissue elasticity is mapped by combining data from both optical imaging and mechanical deformation, is known to be a valuable source of information for the diagnosis of certain ...