

⚡ Empower your projects with precision and safety — the must-have multimeter for every modern maker!
The AstroAI Digital Multimeter AM33B offers 2000 counts resolution to accurately measure AC/DC voltage, DC current, resistance, continuity, and diode functionality. Featuring specialized battery test modes for 1.5V, 9V, and 12V batteries with auto-status detection, it’s designed for both household and automotive troubleshooting. Safety is prioritized with a double fuse anti-burn system and silicone protective cover. Its compact, lightweight design includes a backlit LCD and data hold for ease of use in any environment, making it an essential tool for DIY enthusiasts and professionals alike.








| ASIN | B0CLV8R7QF |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #147 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Multi Testers |
| Brand | AstroAI |
| Color | Black |
| Date First Available | March 18, 2024 |
| Item Weight | 5.3 ounces |
| Item dimensions L x W x H | 3.03 x 5.26 x 1.46 inches |
| Item model number | AM33B |
| Manufacturer | AstroAI |
| Measurement Type | Multimeter |
| Power Source | Battery Powered |
| Product Dimensions | 3.03 x 5.26 x 1.46 inches |
| Style | AM33B |
V**H
Good, inexpensive back-up meter.
Great for an inexpensive, reliable back-up meter. I keep my large, full-featured DMM in my basement workshop, but often have a need to use it upstairs for simple tasks like measuring battery voltage, checking for continuity, etc. Buying this small meter for the upstairs eliminates trips to the basement, and it does everything I need it to do for simple tasks.
D**S
Effective and Affordable Multimeter - would recommend!
I grabbed this multimeter for some basic home and automotive troubleshooting, and it’s been surprisingly solid for the price. The readings are consistent, the display is clear, and switching between modes feels tactile and intuitive. It’s not a high-end professional tool, but for everyday electrical checks, battery testing, and DIY projects, it does exactly what it’s supposed to. Simple, accurate, and budget-friendly. Definitely worth it if you need a reliable multimeter without spending a ton. Love that it's not too heavy and it's compact size.
C**R
Works for testing grounding mats, but cord length and instructions need improvement
I purchased this to test whether my grounding mat was actually working, and in terms of functionality, it does what it’s supposed to do. I was able to confirm that my mat is grounded. However, I ran into a few usability issues that are worth mentioning for anyone considering this, especially if you’re not familiar with electrical tools. The wires are not long enough to easily connect to the grounding port without lifting the device up. In my case, the outlet is positioned much higher than normal, which made it impossible to keep the tester flat on the bed while connected. Because of that, I couldn’t touch the mat properly while it was hanging between the outlet and the bed, which affected the measurement setup. To get a usable reading, I had to touch the mat with my foot instead, which worked, but wasn’t ideal. Another challenge was the instructions. They were not very beginner-friendly. I’m not an electrical tech person, so I had to watch YouTube videos and read online guides to fully understand how to use the tester correctly. Pros: Confirms whether a grounding mat is working Once set up correctly, it provides accurate results Useful tool for grounding verification Cons: Wires are too short for some outlet setups Difficult to use if outlets are positioned high Instructions are not clear for beginners Who this is best for: People who already have basic electrical knowledge or a standard, low outlet setup. Beginners may need additional guidance. Overall: The product works and serves its purpose, but longer cords and clearer instructions would greatly improve the experience especially for first-time users.
H**L
Great price and value, couldn’t ask for more!
Wow! I’d tried 2 other brands to find this little gem that does what it does. Solid, does everything I need it to do, great price, looks and feels solid, love the attention to details like an awesome case, tip covers to keep them protected and lead covers as well, arrived quickly and got to work right away. Great product, great value.
R**H
Easy to use and has directions
Very nice multi meter and easy to use. I would recommend this multi meter and the price point was very good I ordered 2 one was a Christmas present and one for myself. The website said that their was a newer version of this model but it also cost a little more so I ordered the original model and am happy with it.It is a basic multi meter good for use around the house and garage. Would recommend and buy it again.Thanks!
C**S
Great value and worked as expected
I recently had to replace a sprinkler control box which was hard wired into my house fuse panel. I purchased this multimeter to be sure I was safe working with that amount of electricity. I am happy to report that the job is done and I am still alive, so the multimeter worked as expected. The price was hard to beat and it felt like better quality than I was expecting. Happy with this purchase. Very easy to use.
R**S
Very easy to use.
Works well and is easy to use. The features are great. It’s easy to read. The wire length is good and the accuracy seems right.
W**D
Good Low Cost DMM
I am old enough to remember when DMMs (Digital Multi Meters) were too expensive for the average guy who did not use them for work. Today you can get this one for fifteen bucks! It does all the features a DMM needs for around the home - AC, DC, Amps, Ohms, continuity, diode test, battery voltage. This DMM does not measure capacitance or inductance or frequency, if you need to measure those then you will spend more money. It also does not do auto-ranging. But those things generally are not needed for around the house. The display is large and easy to read. All in all a handy easily affordable DMM for when you need one for occasional use and dont want to spend a lot of money.
K**.
- FAIT LE JOB👍👍👍 - LES PILES SONT DEJA PLACEE - MESURES CORRECTES - JE PREFERE LES TOUT AUTOMATIQUE 2025
A**O
tudo ok
S**O
If you dabble in electronics a bit or even if you don't it is avery helpful tool. This worked great. I can check Voltage, Ampearage of my connections. Check if a charger is working. Check plug poits at home. There are literally thousands of applications. I don't do much but the bit I need works great. Recommended in this price point.
I**I
Muy buena funcionalidad, muy completo.
3**D
使用していたテスターが故障したので代替え。 価格の割に機能は十分です。使い勝手もよいです。 OPでワニ口とかあったらよいと思います。
Trustpilot
2 days ago
4 days ago