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The grade of a neutral density gel refers to its level of light reduction, which is measured in f-stops or optical density units (OD)
ND3(0.3)- Take away 1 stop of light= -1 F-Stop
ND6(0.6)- Take away 2 stops of light= -2 F-Stop
ND9(0.9)- Take away 3 stops of light = -3 F-Stop
Higher grades produce greater light reduction and are useful for shooting in bright conditions or achieving longer exposure times.
Lower grades provide less light reduction and can be used for more subtle effects or in moderate lighting conditions.