Great, thanks for sharing the piston. I didn’t expect that a simple refresh would be sufficient. I will try it out and report back.
Edit: I have tried it out, and technically it works (in the sense that it reports values at all), but the reported values are totally off. For a small LED lamp that draws around 3 Watts, it shows 0.1 or 0.3W, alternating. For a water kettle, it shows 241.3 W instead of 1860 W.