AstroAI Digital Multimeter TRMS 4000 Counts(Auto Ranging and Manual)

I have many years under my belt as an electronics engineer diagnosing component level faults on pcb's and I am used to much more expensive DVM's (digital voltmeters) so I feel qualified to review this one. First off the price is really cheap so I wasn't expecting much but I was pleasantly surprised that is wasn't as bad as I was expecting it to be. It's quite light in the hand but feels well made, mostly hard plastic with a hard rubberised outer case which should negate some drops and bangs. The bale stand on the back is flimsy and will probly break if flexed the wrong way too much so just be gentle with it and it should be okay. The screw which holds the battery cover / stand on goes in to a brass insert and not just screwed in to plastic so thats nice. The screen is easy to read at different angles and has nice large numbers on and while isn't the quickest at updating its okay considering the price. The test leads are fine and work okay for general use I cant comment on battery life as I have not had it long, this review is first impressions. I have attached some pictures where I tested the accuracy of this DVM, the DMM Check Plus was Calibrated recently and I checked it with one of my Flukes just before testing the AstroAI DT132A and the Fluke read spot on for each of the tests. The tests performed were AC & DV volts , AC & DC mA and Resistance, you can see the results for yourself.

Good quality and works a treat.

I already have other multimeters, which frankly feel better built, but for all their functions and accuracy none happen to have a max/min function. I wanted to leave a meter in series with my car battery for a day to see if any modules were waking up when they shouldn't be and causing it to lose charge. Once the car has gone to sleep I can press the Max button and when I come back at the end of the day it'll show the highest value. (Hint - not mentioned in the user manual but I found you can disable Auto Power Off by holding down Select whilst turning it on. It'll beep 5 times and then power up without APO displayed on the screen. It'll then beep 5 times every 15 minutes as a reminder rather than turning itself off. APO is restored next time you turn it on) If you need Max/Min capture then this DT132A is an absolute bargain. If you don't need that then there are other cheap meters around that feel a bit more robust. I'd suggest Uni-T, having had a couple of their meters for a few years now. Their UT890C is currently the same price here on Amazon.

Meter does exactly as it should. Good build quality. Easy to read screen. Good clear instruction booklet. Good value for money. Of all the makes and models out there I am happy I settled on this one, having watched a very comprehensive review and test on YouTube (jazztechUK).

My eyesight is not as good as it used to be and I was getting frustrated trying to accurately read my old fashioned analogue needle type meter so it was time to get one with a big digital display. My needs were fairly basic…..checking the status of various rechargeable batteries I have for various things and also being able to do some basic continuity testing when fault finding (I just want a nice loud beep if all is good). This unit perfectly meets my needs. It feels perfectly good quality in my hand, and the display and controls are easy to use. When checking battery voltage, it’s first setting is autorange and the screen looks like it’s showing lots of spurious data before touching the probes, but just a few quick prods of the range button will shift the decimal point to something more useful and stable. It only takes 2 seconds to do this and I thought it was worth sharing as a tip. The thermocouple on my first unit was damaged but a quick email to AstroAI got a replacement sent to me. For this price point I was truly impressed how good their customer service was. I’ve used fancier brand meters (Fluke) and sure, this does not feel like it would be quite as tough as them if used hard day in day out, but the quality is certainly good enough for home use. Great value.

I am no expert by any means. I have bought it to Carry out routine checks around the house as a DIY person. I wanted a Multimeter and had a good search around, reading a lot of reviews and watching few YouTube videos. After an intensive research, I reached a conclusion that if you are a professional then go for the expensive brand like Fluke and it will last you for a life time. On the other hand if you are a DIY person and use it occasionally then AstroAI has so much to offer for a fraction of cost. I picked it up on prime deals for under £20 and it does everything I ever want it to do. Due to Covid 19, my car had been on my drive for months and despite starting Engine and leaving it running for several minutes, I still had a dead battery. I just wanted to check if battery is still good enough to re charge so I bought it and after charging my battery over night. I took a reading and hurray it is still keeping 13.7 watt charge which shows that battery cells are still healthy hence no need to buy a new battery yet. It is also very effective solution to check fuses and even AA or AAA batteries to see if they are new or used. I have already tried it on few things and I am very happy so far with this Multimeter. Word of warning Do not use it on household electrics unless you are a qualified electrician as tools in wrong hands can be lethal.

Works well. Handy tool for checking electrical connections. Everything and more your average diy’er could possibly need.

Item ok

Nu kunde jag mäta lite startkondensatorer. Hur bra som helst. Blir bra i min verktygslåda för el arbete.

Très bonne outils au passage , tester aujourd'hui toute la journée RAS . Pour ceux qui cherche la notice en Français , la notice et disponible en Anglais en Pdf sur le web , ensuite vous faite traduire votre Pdf et vous avez la notice en Français Sa prend 2minute Je parle pour le AstroAi DT132A (4000)

Nice product

Toppertje.

After an intense review of what was available in the digital multi-meter (DMM) product space, I purchased four AstroAI TRMS 4000 meters based on competitive pricing with similar products with similar specifications. These multi-meters were purchased for use by middle and high school students that are participating in the National Science Olympiad program. The features that were required were simple to use, has an easy to read display, is both precise and has acceptable uncertainty, in a physical package that could withstand the abuse/misuse of the students. Most of the digital multi-meters in this same price category, as the TRMS 4000 were NOT auto ranging or too small to have a reasonable size display. The meters with similar features by Fluke, Extech and Amprobe, to name a few, varied in price from ten to twice as expensive. Since I needed four, all of those meters were immediately ruled out. When the TRMS 4000 meter arrived, a quick physical, hands on inspection, revealed a solid design that was well labeled, with an LCD display that was about the same size as my personal hand held Fluke DMM. To test the meters, I used a variety of batteries and precision one-percent resistors to compare the performance of each meter, against my Fluke and against each other. In all cases the TRMS 4000 meters within +/- 4 least significant digits in the three and a half digit mode and +/- 2 least significant digits in the three digit mode. Without doing any real statistical analysis and without true NIST traceable standards, I feel comfortable that these meters were precise with an uncertainty that was within 1% +/- 1 digit in the tested ranges, which seems to correlate well with AstroAI’s stated specification. I should note that the results I obtained with precision resistors was well within the stated specifications. Since these we to be used for Science Olympiad competition, and the general rules prohibit using dangerous voltages, I did not test the AC or higher DC voltage ranges. However seeing the excellent results with low voltage DC and resistance, I would feel comfortable using one of these as troubleshooting tool in a professional capacity on low frequency equipment and appliances. Because TRMS 4000 has a specified input impedance of 10 Meg Ohms, I would not recommend this for use on sensitive instrumentation or high frequency circuits where test input impedances > 100 Meg are recommended and generally required. I would also recommend not using any hand-held multimeter for directly measuring currents in excess of 1 amp even though they may be equipped to do so, external shuts should be used for these types of measurements. In summary, for the price, this is an excellent choice for the serious hobbyist and student. If I had it to do over, I would still purchase these DMMs.