DiFluid Coffee TDS Meter I used to use this for a while, but I haven't used it recently, so I'm putting it up for sale. You need to cool the liquid before measuring (to measure accurate values). I don't think there are any noticeable scratches, but please understand that this is a used item before purchasing. No original box, just the main unit. - Brand: DiFluid - Color: White - Type: TDS measurement - Display: Digital - Function: Liquid measurement