AstroAI MUS4KRD 4000-Count True RMS Digital Multimeter

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Product guide

AstroAI MUS4KRD 4000-Count True RMS Digital Multimeter

Count: AstroAI MUS4KRD is a compact digital multimeter with True RMS, auto-ranging and a Smart Mode intended to simplify common checks. It is listed for AC/DC voltage, resistance and continuity, with non-contact voltage detection for preliminary live-wire checks.

At a glance

Smart auto-ranging detects AC/DC voltage, resistance and continuity, avoiding manual dial changes for these measurements.
NCV detection uses audible and visual alarms to help assess whether a source may be live without using a probe.
Data Hold, a backlit display and built-in flashlight are useful when readings are hard to view or the work area is dim.
At 240 g and listed dimensions of 12.2 x 6.2 x 3 centimetres, it is intended to be easy to carry.

Price

$21.24Save 15%

Reference price: ~~$24.99~~

Price checked: Nov 13, 2026

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Pros and cons

Pros

Auto-ranging covers several common electrical checks without manual range selection.
NCV, Data Hold, auto shutoff, low-battery indication, backlight and flashlight add practical convenience.
Listing states that two AAA batteries, test leads and a storage bag are included.

Technical specifications

15 specifications

Identity and operation
Brand	AstroAI
Model	MUS4KRD
Style	Smart Mode
Measurement type	Multimeter
Power configuration	Battery Powered

Measurements and features
Display counts	4000 Counts
Measurement functions listed	AC/DC voltage, resistance, continuity
Voltage detection	Non-Contact Voltage Function
Additional features	Data Hold, auto shutoff, low battery indicator, backlit display, and a built-in flashlight

Dimensions and construction
Colour	Red
Dimensions listed	12.2 x 6.2 x 3 centimetres
Weight listed	240 g
Case material	ABS

Power and rating
Battery requirement	2 AAA batteries required. (included)
Specification met	CE, RoHS, CAT II 600V

What to know before buying

The listing identifies the measurement modes as AC/DC voltage, resistance and continuity. It does not state current measurement, so buyers needing current testing should verify that capability before purchase. NCV alarms are presented as a way to help judge whether a source is live, not as confirmation that a circuit is safe to touch. The specified CAT II 600V rating is the listing's stated rating, not a guarantee for every measurement setup.

What’s in the box

User manualIncluded
Pair of test leadsIncluded
Storage bagIncluded
2 AAA batteriesCheck selected pack
MultimeterIncluded

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

DIY users checking AC/DC voltage, resistance or continuity in electrical circuits and components.
Buyers who want auto-ranging and a non-contact voltage alert in a pocketable meter.
People who value a backlit display, flashlight and storage bag for routine troubleshooting.

Less suited to

Buyers who require confirmed current measurement or additional functions not stated in the listing.
Anyone seeking a substitute for appropriate electrical safety procedures or qualified work on hazardous circuits.

AstroAI MUS4KRD 4000-Count True RMS Digital Multimeter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 1,375 ratings

5 stars76%76%
4 stars12%12%
3 stars6%6%
2 stars3%3%
1 star3%3%

Customer feedback describes the meter as easy to use, good quality and compact, with reported satisfaction around accuracy and storage. That feedback fits its stated role for common voltage, resistance and continuity checks, while opinions about its auto-operated function vary. The listing's auto-ranging claim is a product specification, not a guarantee of every customer's experience.

Positive themes

Customers report straightforward operation and good overall quality.
Feedback mentions satisfaction with voltage-reading accuracy, compact size and storage.

Mixed feedback

Customer opinions vary about the auto-operated function.

Frequently asked questions

What measurements does this multimeter list?

The listing names AC/DC voltage, resistance and continuity. It does not specify current measurement.

Does it have non-contact voltage detection?

Yes. The listing describes NCV detection with audible and visual alarms to help judge whether a source is live. Treat it as an indication, not proof that a circuit is safe.

What comes with the meter?

The explicit included-components list names a user manual, a pair of test leads, a storage bag and the multimeter. Separate listing details also state that two AAA batteries are included.

Is it suitable for carrying in a tool bag?

The listing gives a weight of 240 g and dimensions of 12.2 x 6.2 x 3 centimetres, and describes the design as portable.