My only concern with the scale, if for some reason your house gets searched by the police, you could wind up in jail. With the hookah and a scale, they may consider it drug paraphernalia. Just my two cents and I wouldn't want to hear you got thrown in jail for a scale.
Wouldn't there have to be "NHT evidence" (not sure how exactly to put that based on forum rules) for it to be paraphernalia? I've always been somewhat worried about the misconception that hookahs aren't for shisha and how that all applies (i.e. i feel like they'd test it, etc.)