Free Hydrometer with Purchases Over $35 | To receive your FREE triple scale hydrometer purchase $35 worth of qualifying merchandise at any retail location. Then just mention this promotion. Offer valid 24 hours, in-store only on 5/27/2016 or while supplies last. Offer cannot be combined with any other offers, promotions, or discounts. $35 subtotal cannot contain Blichmann products, gift cards, or the promotional hydrometers.