Check Out an Inexpensive High-Voltage Probe with Power Outlet

Caution: The isolation transformer is used in this experiment for electrical safety
This high-voltage probe features a 100:1 attenuation ratio, with a maximum input voltage of 2000 volts.
The input signal is high-voltage AC from the power outlet.
As a general rule, high voltage should be avoided unless absolutely necessary.

[@ernieschatz3783]

This is still unsafe. By using an isolation transformer, your ground is floating. Best not to do that. Keep you scope grounded and use a differential probe.

[@norbert.kiszka]

When scope GND is connected with PE (earthing) like in this case, then You shouldnt use passive probe as You shown. Use differential probe instead.

[@tpg3942]

thank you, the outlet is from an isolation transformer

[@norbert.kiszka]

​@@tpg3942 that is one of methods. In this case You should warn viewers how to do this safely for them and scope. If they switch L with N or they have TT type grid, then all metal things coming outside of scope (BNC, USB and test generator sockets) are under high (dangerous) voltage.

[@GiC7]

Thanks

[@johndevires5911]

Is it safe to use high voltage on a breadboard?

[@copernicofelinis]

The short answer is "no".
The long answer is "#3// NO!"