Peak atlas esr low resistance and capacitance mmeter esr70 peak esr70 p measuring a capacitor s esr is a great indicator of capacitor condition the atlas esr offers instant results just connect the probes and press test innovative audible alerts give you an instant feedback of the measurement results with further detail shown on the screen p p and the tones themselves are surprisingly pleasant including bell like pings and also a beep barp type tone for esr that is likely to be