The one i have is fine up to the high 120s then it starts to read 'over' when it is clearly getting much louder

Im not looking to pay hundreds for a meter just for this purpose though, so if thats the case I'll just settle for what i have or the time being.
you can just see the 'over' in the bottom right of the meters screen.
This was my dually t60 in the corner with a 40Hz tone going to it.