I though all scopes were in the 20-30V input range.
Yeah, per cm maybe. That's still 200V ish.
I'd really like to comprehend this perception of max scope input by Simon.
Sure it looks like Simon forgot zero's, but twice?
Even then he's a hundred volts shy of scopes that are available.
For EE's not to know what the max p-p input of a scope is pretty poor.
Many CRO's and DSO's have a max p-p input of 300V and are historically designed for/in countries with 110 VAC mains.
Today with the prevalence of SMPS that need repair, a scope with 300V inputs must be used with extreme caution on the primary side of SMPS.
Why?
A very large part of the world has 230 VAC mains and when recified in the primary side of SMPS is ~325 VDC. Should one forget to switch a probe to 10:1.....you've just exceeded the max input of your scope. It might not go pop, but should your mains be ~245 VAC, then your're well over max.
For those considering work on mains, be very carefull with scope and probe selection and as in the explanation above I'll always recommend scopes with 400V inputs, just as in the full Siglent range of DSO's.
end rant.