日本得乐TECLOCK橡胶硬度计GS-719H,GS-720HIncasethereunevennessonthemeasuredface,lessflatfacebecauseofirregularshapeanddeepbumpatthebottom,depressedfaceofdurometerisdifficulttoreachandsometimesaccuratemeasurementisnotpossible.Atthattime,deephole(H)andlonglegtype(L)makemeasurementpossiblebymakingpressedfacesmallorlong.Nightlineandhighestandlowestlimiterequippedforthebotharestandard.Then,longlegtypecomplieswithDIN53505.