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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 TM 503 Module Combo FG 501A AM 502 DM 502 Tested
$150.00
TEKTRONIX TM503 3-Slot Mainframe with PS503 / DM501A / PS509 Counter
$250.00
Tektronix TM506 Chassis Mainframe Module for TM500 Test Measurement System
$149.59