Mastervolt Mass Sine Wave Inverter 24/2500 (230V/50Hz) [24022500]Mass Sine Wave Inverter 24 2500 (230V 50Hz) For the toughest tasks Mass Sine sine wave inverters are designed for the toughest conditions for professional, semi professional and recreational purposes. Even under the most extreme conditions the products from the Mass Sine series operate faultlessly, giving you round the clock output when necessary. The sustainability and technologies that underpin the Mass concept have long been proven in practice.