Sorry, but I see no significant difference in this gauge as opposed to countless others. Steel rods this long are as boingy (technical term for modulus of elasticity) as anyone else's steel rods.
I looked into making some better wall gauges and concluded that the inner rod should be high modulus material like boron or tungsten carbide. The other outter indicator support rod should be a high modulus, low weight structure like a builtup carbon trestle beam and the indicator should be of the lowest weight possible. Then the thing should be used vertically.
Just my 2 cents.
