Original rating was probably stamped right on the side in faded paint, half an inch from a rust hole. Bet it says something like "50 PSI max" when people are trying to push 150 through it. Modern engineers just look at the thread size and assume it can take whatever the new pump puts out. Saw a guy try to use a 1940s boiler valve on a modern system once. That thing was basically a hand grenade waiting to go off. Ever blown a gasket because you trusted a number that wasn't there?

Yeah, those cheaper digital levels can be decent for basic stuff, but they don't hold a candle to a proper laser alignment kit for elevator work. The laser just cuts through all the guesswork, especially on longer runs where a level can drift. If you're planning to do this kind of job more than twice a year, it's worth the money. The time you save alone pays for it pretty quick.