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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for He tests his metal 6 letters:

ASSAYS: Metallic tests
WELDER: He tests his metal
ASSAYS: Tests one's metal
ASSAYED: Tested, as metal
ASSAY: Test one's metal?
ASSAY: Metal's purity test
ASSAY: Test a person's metal
ASSAY: Test, as for a metal's purity
ASSAY: Test of one's metal