![](https://erichsen-usa.com/wp-content/uploads/sites/3/2014/04/426.png)
A practical instrument with tungsten carbide tip 0.5 mm in diameter. The instrument is used for standardised scratching of corrosion test samples.
A practical instrument with tungsten carbide tip 0.5 mm in diameter. The instrument is used for standardised scratching of corrosion test samples.