Accuracy of weighers (what ever type) on timber trucks

[cessna]

Are on board timber truck weighers( whatever type) as accurate as an approved  weigh bridge ( one that is tested by trading standards weights and measures dept).   

[BARNSLEY BOB]

No.

[gdh]

Assuming they're calibrated correctly there shouldn't be enough difference to worry about about but they won't be as accurate as a weigh bridge because there's a little a bit of swing affecting every time you weigh.

 

We have one on our timber trailer and I remember testing weighing a 9 ton load on and off and having a 20kg difference.

 

Weigh bridges aren't perfect either because they don't take into account how fuel in the tank or stuff in the cab.