| Härtetest | Nominativ, Singular | nominative case, singular | |
| Härtetest(e)s | Genitiv, Singular | genitive case, singular | |
| Härtetest(e) | Dativ, Singular | dative case, singular | |
| Härtetest | Akkusativ, Singular | accusative case, singular | |
| Härteteste | Nominativ, Plural | nominative case, plural | |
| Härteteste | Genitiv, Plural | genitive case, plural | |
| Härtetesten | Dativ, Plural | dative case, plural | |
| Härteteste | Akkusativ, Plural | accusative case, plural |