A complete Electrolysis Unit which consists of a "H"-shaped glass tube that is fitted with graduated gas collection tubes. The "H"-tube is 22mmOD x 150mm length x 75mm width. The collecting tubes are 14mm OD x 150mm length and are graduated to 14mm. The collecting tubes are fitted with a pair of high quality Platinum Electrodes, #501-2. The Electrolysis unit is supported on a cast iron stand and attached with a burette clamp. Everything listed is supplied including an instruction manual.