Suntan in single turn cermet potentiometers suntan tsr 3386f 504r fully enclosed 500k 38in 10 05w single turn cermet potentiometer from the suntan wr3386f series sealed to withstand industrial cleaning solvents and harsh environments used for trimming the value of a resistor and commonly used for calibrating instruments suntan tsr 3386f 504r 500k wr3386f 38 1 turn cermet trimmer