Oscilloscopes observe the change of an electrical signal over time. Unlike a traditional ammeter, which uses a detector needle mounted against a scale to measure current, a digital oscilloscope measures a bright, readable signal via a waveform. This waveform analyzes the signal’s amplitude, frequency, rise time, time interval, distortion, and more. We carry handheld oscilloscope models as well. Zoro has other testing devices, including test leads probes, current probes, analog multimeters, power meters and analyzers for every type of electrical measurement task.