This vacuum machine(SS-V03) is used for take out / deflate air from products. Widely used for take out air after resin / paint on the polish paper, polish fabric, polish roller, grinding roller, grinding paper, grinding fabric, etc.. so that make sure the products be high quality. The machine there are vacuum meters, and small monitor windows for you monitor the operation and monitor the vacuum pressure. also can use the digital timer to setup and controll the vacuum pressure. Easy to use.