I have the feeling that the lifespan of one of those multipliers when used with an impact wrench, any impact wrench, would not be very long. Think about taking a ratchet and beating on the handle with a hammer to loosen a fastener.
Not supposed to use an impact on them. We used them when I climbed wind turbines, but not with an impact and the good ones were not cheap. However, we were using them to torque stuff so they had to be accurate. The Northern tool cheapo might be ok for disassembly, but most impacts ought to exceed it's rated capacity anyway so unless you don't have an impact it's doesn't make sense.
I have never used an impact with a Torque multiplier.
I have a Williams that is 37 years old.
I posted the torque multipliers because many people have the mindset: I have got to use an air/electric impact gun to loosen this big tough nut.
The huge slurry pumps made of super hard, wear resistant “White Iron” like the Georgia Iron Works or Warman are also hugely expensive.
They have huge nuts to torque but you need to avoid big impact guns that could crack a $40,000 casing.
With the torque multipliers you can gently and predictably tighten and loosen.
If it is your desire to actually break a bolt, you can do that gradually too, the bolt does not have to “snap”
In mining schools that study the strength of rocks it has been a big advance to use “stiff” monster sized presses to slowly find the breaking strength of rocks. Most rock failures in tunnels fail slowly, although terrifying “rock bursts” or “bumps” do happen.
