Stens Replacement Metal Deck Leveling Gauge Universal Used to accurately level and measure mower decks on all riding and walk behind mowers , - Deck is level if heights are the same. If not, deck adjustments will need to be made. , Measure tip to tip cutting edge (side to side and front to back) , USE GLOVES TO AVOID INJURY , - Measure one side cutting edge. Check height on gauge , - Measure other side cutting edge. Check height on gauge.