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Used, in good working order. Two modules drift slightly and will need calibration, but all 4 DM 501A units are functional. Includes TM504 with 4 DM501A multimeters. No other parts included.
Tektronix TM503 Power Supply Module
$87.99
Tektronix TM503 Power Supply Module W/ 067-0645-01 , 067-0645-02 Extender Cable
$527.99
TEKTRONIX TM504 Mainframe w/ DC503A PG501 & PG507 Plug-In Modules
$395.00