Project has an odd spec were they are imposing a 5% tolerance on the minium fibre dosage. It was my understanding that this was normally a field test with jury rigged equipment, usually based upon sieving.
Someone mentioned something about seeing a referene to a 'washout machine' and I have found a single reference to it in the magazine Concrete Construction (2007). I have tried to track down the company, but cannot find any information on them.