glaze hardness - test pen source

updated tue 9 feb 99

Ditmar/Gayle on mon 8 feb 99

You can find a set of hardness testers at Miners Inc. A geologist &
engineer supply house, in Riggins, Idaho. 800 824-7452

3 double ended testers - Mohs hardness 5, 6, 7, 8, 8.5, 9.
# KO 685 $28.70

They're also the only ones I've ever found selling a cast iron mortar.
Great for those super grinding projects / experiments. Holds about a pint.
$40

From Alohaland, Ditmar.