Application: The apparatus is used for measuring water impermeability property of asphalt linoleum and elastic asphalt waterproof roll, pressure is exerted by electric air pump, Convenient in operation. 1. Power voltage: AC220V 2. Working voltage: 12V 3. Power: 60W 4. Test specimen quantity: 3pcs (one group) 5. Working pressure: 0.1Mpa 6. Max. pressure: 0.6Mpa 999minute free setting Automatic alarm when finish test