AstroAI AM33B 2000-Count Digital Multimeter

Count Digital: AstroAI AM33B is a battery-powered, manually ranged multimeter for basic electrical checks at home and on vehicles. It measures AC and DC voltage, DC current, resistance and diode function, with continuity buzzer and battery test modes. The listing specifically says it cannot test AC current.

At a glance

Manual range selection gives the user control over measurement ranges but requires choosing the appropriate setting.
The listing describes AC and DC voltage measurement, DC current, resistance, diode testing and a continuity buzzer. It explicitly excludes AC current measurement.
1.5V and 9V battery modes are described as automatically displaying battery status. A 12V battery mode is also listed.
Data hold, auto shutoff, a backlit LCD and low-battery indication are listed.

Price

$14.58Save 23%

Reference price: ~~$18.99~~

Price checked: Nov 12, 2026

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Often bought together

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Pros and cons

Pros

Covers common household and automotive checks, including AC/DC voltage, DC current, resistance, continuity and diode testing.
Includes dedicated 1.5V, 9V and 12V battery test modes, with automatic status indication specified for the 1.5V and 9V modes.
Backlit display, data hold, continuity buzzer and auto shutoff support practical troubleshooting.

Cons

Cannot measure AC current, as the listing explicitly states.
Manual range selection requires the user to select a suitable range rather than relying on auto-ranging.

Technical specifications

18 specifications

Identity
Brand	AstroAI
Model	AM33B
Display count	2000 Counts.
Range selection	Manual

Measurements
DC voltage ranges and accuracy	200mV/2V/20V/200V/600V ±(0.5%+3)
AC voltage ranges and accuracy	200V/600V ±(0.8%+5)
DC current ranges and accuracy	2000µA/200mA/10A ±(1.2% +3)
Resistance ranges and accuracy	200Ω/2KΩ/20KΩ/200KΩ ±(1.0%+3)；20MΩ ±(1.5%+3)

Power and battery
Power configuration	Battery Powered
Meter power specification	2 x 1.5 V AAA Batteries
Battery test modes	1.5V, 9V, and 12V battery test modes

Operation and protection
Sample speed	3 Times Per Second
Overload indication	"OL" Displayed
Fuse protection	mA: F250 mA/250 V Fuse；10 A: F10 A/250 V Fuse

Environmental and category ratings
Environmental conditions	CAT II 600 V; CAT Ill 300 V Pollution Level 2 Temperature and Humidity 32-104 ° F (0-40 °C)；(<80% RH, <10 °C RH)

Dimensions and installation
Dimensions listed	3.03 x 5.26 x 1.46 inches
Weight listed	0.15 kg
Color	Black

What to know before buying

Listing details to confirm

Listing specifications include CAT II 600 V and CAT Ill 300 V, but the category text uses the inconsistent designation “CAT Ill.” The manufacturer also claims double-fuse overload protection and a protective silicone cover, while the supplied contents list does not mention batteries or a cover. Confirm the applicable rating and selected package details before purchase.

What’s in the box

Included

1 x Multimeter
1 x Test Leads (Pair)
User manual

Who is it for?

A good fit for

DIYers checking household electrical components, fuses and batteries within the stated measurement functions.
Hobbyists or automotive users troubleshooting vehicle electrical components and charging systems who need DC current, voltage, resistance and diode checks.

Less suited to

Anyone who needs to measure AC current.
Buyers seeking automatic range selection.

AstroAI AM33B 2000-Count Digital Multimeter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 1,608 ratings

5 stars79%79%
4 stars13%13%
3 stars4%4%
2 stars2%2%
1 star2%2%

Customer feedback highlights basic-function performance, ease of use, compact size and screen readability. These qualities suit straightforward checks using the listed manual ranges and backlit display. Accuracy feedback is mixed, with some customers reporting accurate readings and others describing voltage-measurement issues, so buyers relying on precise readings should account for that uncertainty.