It is intended for determination of electrical conductivity of substances, comparison of electrical conductivity of concentrated and dilute solutions, electrolysis of salts and water, testing of electrolysis products and electrochemical corrosion of metals. The set includes: a container for electrolytic bath with a lid on which current leads with two universal electrode holders are placed; electrodes: steel - 2 pcs, copper - 2 pcs, zinc - 2 pcs, graphite - 2 pcs; Hoffman apparatus; milliammeter.