Non-destructive or micro-destructive techniques are widely used to detect the density, strength, sound speed and dynamic elasticity of woody materials. In this paper, the methods and equations of measuring the longitudinal, transverse and torsional vibration modulus of wood are briefly illustrated. Many authors have misused formulas and units from the published literature survey. Therefore, the purpose of this paper is to illustrate the correct use of wood non-destructive testing formulas and units. By clarifying and discussing the cases of misuse and substitution here, the academic community can use the relevant formulas correctly in the future, and can also avoid continuing to misuse the wrong formulas.