The 6510 is the Wine Preserver that shows you the vacuum Stopper with V-Gauge & Stainless Steel Pump. “Did I pump enough vacuum?”, “Did the vacuum hold?”. With V-Gauge, you’ll never have to ask those questions again!
With the V-Gauge Wine Preserver, you simply pump until the needle reached the “red zone” on the gauge. Once you've reached the red zone, you know that you have achieved the necessary vacuum. Later, the needle in the red zone tells you that your wine has been preserved. A patented Metrokane innovation, the V—Gauge is packed with a stainless steel vacuum pump.