Vishay/Spectrol POTENTIOMETER Models 534, 533, & 535 Spectrol is changing the part marking method of Models 534, 533, 535, and 536. They are changing from printed adhesive label, to ink marking on side of housing. This change is to improve the quality and reliability and allow the part number to be easily identified. Please contact a Mouser Technical Sales Representative for more information about this change. 5-0307-18