A set of laboratory scales. Weighing up to 100 grams. Gost 7328 4th class GOST 7328-61 STATE STANDARD OF THE USSR General purpose kettlebells must be made of six accuracy classes: 1, 2, 3, 4, 5 and 6. The scope of application of general-purpose scales of each accuracy class must correspond to the one indicated below. Class 4 — for technical analyses and weighing of medicines; The set is new. Bakelite box. The manufacturer is Sofia Kofardzhiev, Bulgaria.