Table 7 Determination coefficients of mechanical properties (MOE and bending strength) estimation models using non-destructive testing devices from several authors

GrindoSonic MK5^(v)

Edyn₀

0.72

0.58

Japanese larch

Roundwood

Vries and Gard 1998

0.76

-

Douglas fir

Accelerometer^(v)

Edyn₀

0.60

-

Jack pine

Wang et al. 2002

0.75

-

Red pine

Sylvatest Duo^(u)

Edyn₀

0.48–0.83

0.49–0.74

Lemon-scented gum^(H)

Pelizan 2004⁽¹⁾

Sylvatest Duo^(u)

Edyn₀

0.68

-

Salzmann pine

Hermoso et al. 2007

PLG^(v)

Frequency

0.43

-

Spanish juniper

Villanueva 2009

Microsecond Timer^(s)

Edyn₀

0.57^(L)

0.57

Salzmann pine

Aira et al. 2019

0.49^(L)

0.45

Scots pine

Microsecond Timer^(s)

Velocity

0.64^(L)

-

Sweet chestnut^(H)

Vega et al. 2019

Edyn₀

0.67^(L)

-

Hitman ST300^(s)

Velocity

0.53

0.59

Scots pine

Sawn timber

Auty and Achim 2008⁽²⁾

Hitman HM200^(v)

Velocity

0.73

-

Maritime pine

Santaclara and Merlo 2011

Microsecond Timer^(s)

Velocity

0.50

-

Black poplar^(H)

Casado et al. 2013

IML Hammer^(s)

Edyn₀

0.49–0.83

0.81

Sitka spruce

Moore et al. 2013

Hitman HM200^(v)

Edyn₀

0.45–0.80

0.68

USLab^(u)

Velocity

0.64

0.67

Daintree stringybark^(H)

Lemon-scented gum^(H)

Saligna gum^(H)

Maritime pine

Bertoldo 2014⁽¹⁾

Hitman ST300^(s)

Velocity

0.78

0.38

TreeSonic^(s)

Edyn₀

0.27–0.57

-

Noble fir

Norway spruce

Western hemlock

Western red cedar

Gil-Moreno and Ridley-Ellis 2015

Hitman HM200^(v)

Velocity

0.63

-

Hitman HM200^(v)

Velocity

0.49–0.67

0.20

Loblolly pine

Butler et al. 2017

TreeSonic^(s)

Velocity

0.43

0.29

Douglas fir

Krajnc et al. 2019c

0.05

0.03

Norway spruce

0.02

0.04

Sitka spruce

Hitman ST300^(s)

Velocity

0.41

0.27

Sitka spruce

Simic et al. 2019

Edyn₀

0.55

0.47

MTG^(v)

Frequency

0.47

0.28

Edyn₀

0.66

0.50