Old Vintage Rare Hydrometer USSR battery Indicator density electrolyte in the car VAZ Condition: Used, works Year: 1977 The hydrometer of a somewhat unusual design with a measuring container made of plastic in practice turned out to be stronger than traditional glass counterparts that are used throughout the world. As for such a simple, unpretentious and reliable device, which is able to lie under the rug in the passenger compartment for a long time without losing its operational properties, there are practically no foreign analogues, with the exception of plastic pointer hydrometers with one eccentric-type float.