MIL-SPEC · Electronic Components
AN/USM-21
Ohmmeter — Test Instruments
Part NumberAN/USM-21
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN6625-00-669-2360 (NSN)
Federal Item NameOHMMETER
Federal Supply Class6625 — Test Instruments
Measurement Range+10.0 TO 1000.0 MILLIOHMS SINGLE INDICATOR SECOND RANGE
Power SourceINTERNAL
ColorUNABLE TO DECODE
Style DesignatorRECTANGULAR OR SQUARE
Overall Height5.750 INCHES NOMINAL
Accuracy In Percent-1.0 TO 1.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE
Overall Width7.500 INCHES NOMINAL
Movement Suspension MethodJEWEL PIVOT BASE
Furnished Items And QuantityTEST LEADS 2;PRODS 2;BATTERY 1;CARRYING CASE 1
Operating Voltage Rating In Volts1.5 DC NOMINAL
Overall Length8.375 INCHES NOMINAL
Vendor Part Numbers126-5002, 126-5002REVA
Cancelled NSN6625-00-630-8674 (cancelled)
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is AN/USM-21 available?
We can source AN/USM-21 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is AN/USM-21 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If AN/USM-21 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like AN/USM-21?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for AN/USM-21?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.