This Golden-Scaled Cudgel was initially a Divine Weapon that could transform into different sizes. After evolving in Pure Yang Water, it had turned into a Pure Yang Celestial Device. Although it could not be compared to the Highest Heaven Celestial Devices like the Void Traveller, it had its own strengths as well.
Just by weight alone, the Golden-Scaled Cudgel weighed the same regardless if it was big or small. But right now, the weight changed proportionately with the size.
When it was the size of a sewing needle, it weighed slightly more than a real sewing needle. When it was enlarged, the weight of the pole increased as well.