The Samsung dishwasher turbidity sensor (DD81-02151A) detects soil levels in the water and transmits this data to the control board. If your dishwasher isn't cleaning efficiently, or you notice leftover particles on your dishes, a faulty turbidity sensor might be the cause. Disconnect the dishwasher from power before installing this part. Wear gloves to protect your hands. Verify your appliance's model number for compatibility before purchasing.