Product Details:

• Light Turns On Whenever The Vacuum Level is Sufficient for Lifting The Maximum Load Weight
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  This is available for many of Powr-Grip's® below-the-hook vacuum lifters. This option consists of a vacuum monitoring system with a green indicator light, which turns on whenever the vacuum level is sufficient for lifting the maximum load weight. In this way, the Green Lift Light provides visual assurance to the operator that the vacuum lifter is attached correctly and ready to lift a load.