Back Tool and Test Equipment Requirements (Table 1) | Up TM-11-6625-298-14 Ohmmeter ZM-21/U ( NSN 5950-00-645-2191 ) Ohmmeter ZM-21A/U ( N S N 6625-00-643-1030) and Ohmmeter ZM-21B/U ( NSN 6625-00-581-2466) Manual | Next TABLE I. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR OHMMETER ZM-21/U, ZM-21A/U, AND ZM-21B/U |