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erineva kõvadusega (8H kuni 4B) pliiatsiga materjali pinna kriimustamise teel määratav kõvadus (vt pliiatsikõvaduskatse), hardness measured by scratching surface with pencils of varying hardness (8H to 4B) (see: pencil hardness test)
pencil hardness . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/pencil%20hardness/1/eng (09.07.2026)
