Lomvum T28B Multimeter Review & Teardown

[@learnelectronics]

Yep. I missed the 2 PTCs by voltage input. My mistake. Thanks for poiti g it out.

[@yambo59]

lol - no problem I miss a lot of things these days (almost 60) --- but hard to believe they didnt give that meter a once over especially before sending it for a review--- didnt do themselves any favors did they-? lol looks like it would have been ok otherwise, whattaya think wrong resistor used somewhere or glitch in the software ??

[@troytaylor1913]

What has been seen can not be unseen. It was even screen printed on the board.

[@jjab99]

Hope you feel better soon buddy. Best of luck with the surgery and get well soon. Don't worry about us or making videos, we will be here for you when you are up and running. Have fun, Joe

[@totalchips6547]

I bought this meter from Amazon months ago. I was one the ones who posted a review you can check on that. My meter did not have any problem, actually I am very happy with the meter performance. The input protection is not great as cat IV, but perfectly ok for home or electronics jobs. The input protection is clamping transistor, 2 ptcs and 2 small ceramic fuses is more than other cheapo multimeters. One more thing is true RMS. I hope you get better. This was no your best review.

[@MrTimjwilson]

You are correct! He should have edited the video or removed it altogether instead of allowing viewers like Pete getting entirely the wrong idea.

[@alerighi]

I also have this meter and for the price I can't complain. Also the NCV test is useful in a lot of situations, when you want to trace a cable for example, it comes with a temperature probe that is always useful, it has a light that is useful for when the power is out and you are trying to search the fault, it can also measure frequency that can be useful for generators to ensure that the power output is correct. The case is well made, it has a stand, and a magnet to attach it to the device you are testing or on a ladder. Only thing I don't like is that the AC and DC voltage/current ranges are not separated (it defaults to DC and you have to press a button, annoying since I use it mostly on AC circuits) and the continuity function is shared with the resistance one (and you have to press a button). If they had made the knob bigger separating the ranges it would have been better.

[@ats89117]

There are two components labeled at PTCs on the lower left of the board near the V IN input. See 14:08.

[@Blackmage50]

If someone gets upset that you're running your AC they are fully able to leave and let the rest of us view in peace. Love the reviews keep them coming. I just bought the uni-t 210e based on your review of it! 👍

[@dm55]

Besides that one bad reading you didn't really say why you couldn't recommend it.

[@paulkeizer6388]

I am very sitisfied with this meter. No problems at all. Everything ok.

[@MichaelFrimlPhotography]

Me as Well. !00 % works

[@TheRadiogeek]

I hope you get feeling better very soon. Take care and good luck next week. 👍

[@aurthorthing7403]

I'm curious if this is a programing issue, poor solder joints or possibly the wrong parts were installed? I think it deserves further investigation. I like the magnets in the holster. That's something I've been trying to build into one of my meters because these add on magnet straps cost WAY too much.

[@MalagasOnFire]

The meter in auto range was not liking 1M it was decreasing, but it should got spot on in seconds. at 15:29 two green components are marked as PTC / PTC1 on the PCB but are really PTCs? Hope you get better .

[@davidglynnguitars8119]

Prayers for a successful surgery and a quick recovery!! Keep the AC running!! You need the cool air in this heat!! Go back to using the same meter leads on all reviews. It takes the variable of the leads out of the equation. Most importantly, take care of yourself, we will be here when you are feeling better!!

[@Pyridox]

That was strange this meter had problems reading 1M in auto mode, yeah I think I'll pass on that one. Good luck with your surgery next week, hope it all goes well.

[@henrikjensen3278]

Looks like the common multimeter chip for cheap "good" meters (DT0660), but they forget to calibrate the Mohm range. I would have expected calibration of all range was done on some automatic rig. The lack of good protections is standard on cheap meters, but they will usual handle 230VAC, i.e. normal mains voltage (If they handle 230VAC, they will also handle 120VAC). The layout of the circuit board looks fairly good (For a cheap meter).

[@mstrxxx0072]

How was the surgery?? I hope u be fine

[@wreckless_-jl6uu]

*VERY WELL DONE, Paul!!!*

[@keithking1985]

No no no Paul. The way you were testing meters with your own probes(the low resistance gold tip ones) was a far better way and much more fairer and accurate way to review a meter. Don't fall for peer pressure. I liked the way you used to do them. Just saying👍

[@antibrevity]

Yes, but the stock probes should be tested as well, since that's what many buyers will be using. First, check with the stock probes, then check with the good ones. That way viewers get a sense for how good the stock probes are *and* how good the meter can be with good ones.

[@keithking1985]

@@antibrevity that would be the fairest way.

[@bwmovers]

The wrong reading of high resistance could be caused some left of solder flux during production that's a high impedance circuit, if you noticed every time he tested the resistance was lower, a little cleaning with Isopropyl alcohol on the P circuit near the probes will fix it.

[@keithking1985]

Get well soon Paul.

[@swift4311]

Can recommend or can not?

[@antibrevity]

Hope everything goes well and that you soon feel better!

[@noelandrew3600]

Having surgery myself on the 26th, so best of luck with yours. mine is hand surgery so going to put my lab out of action till its healed up, dupuytren's contracture is the problem they are going to fix, so hopefully it will make life a load easier.

[@learnelectronics]

I wish you well.

[@circuitblog01]

Ihope you be come safe my freind god bless you and god be with you and protect you

[@MrVosh-nj2lc]

If you felt better I'd suggest measuring a range of resistances from 100k ohms through about 2 meg ohms or so in auto mode. This could be used to show the onset and trend in the resistance deviation. Just sayin'.

[@learnelectronics]

Sounds like a good idea

[@kennethanderson7642]

Thank you so much for your service to the community. Knowledge is one of the few true investments in life, and you have shared so much with us.

[@riteshpahladsingh3819]

Is this a auto ranging multimeter?

[@MrSlartybartfast42]

I've got one of these meters (under £13 from Amazon UK). I've just tested a 1M-ohm resistor and it came up as near enough 1M-ohm. I can only think that the one in this video was a rogue one. You would have thought the manufacturer would have tested it before sending it out to be reviewed!! So far mine seems ok but I really don't like the leads that were supplied....I would have prefered leads that you can screw croc clips to.

[@chrisblank9090]

that's a defective multimeter. I bought one and the resistance function works both in auto and manual range mode

[@andydoddington2993]

After seeing this review I thought I'd made a dumb decision getting one of these from Amazon. However, I just tested it with a 1M resistor and it behaved just fine. Agree that the test m/c must have been defective.

[@yambo59]

I saw two green PTC's on the lower left of the input jacks....

[@claudiuadrian11]

they are clearily 2 ptc on there next to the V in timelapse 15:23

[@ats89117]

Probably a firmware problem on the high resistance auto-ranging scales...

[@RGsedona]

Brutally honest, love it.

[@Indiskret1]

Amazon had "todays deal" on the same meter, just named "AoKoZo" instead. Good thing I came here before buying anything. Thanks for the review!

[@pulesjet]

In all truthfulness it is best test the DVM with Probes Supplied. If there CHIT, there CHIT too. About your Voltage Reference . Did you get a Photo Copied sheet with Measured Output like most people ? Same Numbers LOL ? They didn't bother sending me one. The first one I receive was DOA. Took weeks to get the guy to send a replacement. I'm just assuming the Manufacturer specs are close enough + - 3 mV @ 5V with the AD584L version. Assuming the AD584L is even Original or Clone ? Would the Chines do that ? Snerk.. I have two units and both are within .001V from each other. I'm quite sure the Reference chips are in fact Authentic. Again, I'll be keeping my Mastech. Good Vid. You should be feeling better here in a hour or so. I just sent you some Good Vibs with a nominal dose of Fairy Pixie Aura Dust in the wind.

[@pda49184]

That was interesting to say the least.. I can't work out how that could be acceptable on everything else , but doubling up on 'one' value of resistor or was it just a 'Fluke' ? 🤣...Well done for gritting your teeth and doing the review Paul.. Best wishes from the UK on your op next week.. See you back here when you're recovered .. 🤞🏼

[@RedPixels_]

Hey! I just bought this multimeter and I noticed that when I turn it on, in the screen, I can see "MIN-MAX" and also a Δ symbol. Do you know how to activate those functions? There are no dedicated buttons apparently.

[@learnelectronics]

I do not, sorry.

[@RedPixels_]

@@learnelectronics no problem.

[@RedPixels_]

@@learnelectronics Today I tested 1MOhm resistance, and the meter actually displayed correctly 1.002 MOhm. Probably yours was faulty?

[@eddybash1342]

@@RedPixels_ i do think it was a bad value burnt in the firmware. ;)

[@haroldpalmer3245]

Thanks for video, again I'm a newbie to electronics and your videos help. I've got a guitar pedal DIY kit and I'm going to attempt it this weekend.

[@mikeoliver3254]

Wow that meter sucked. I would not trust it to read anything without having a know good backup meter and then what’s the point. Great job on the review Paul. Hope you get to feeling better soon, and hopefully the upcoming surgery goes well. We’re here for you if you need us Paul.

[@shaunmorrissey7313]

no it really doesn't, this guys crap

[@johnf3326]

What was the lowest ohm range? Looking for a very low range maybe 0-10 ohms

[@learnelectronics]

It read 2.2Ohms no trouble

[@westbay5858]

I’m looking for one that can read below 1uf even below 500 pf.

[@RFADICTOS]

exelente video amigo lo recomiendo al 100%

[@frankowalker4662]

Whats the point of a meter you can't trust? Good luck on friday!

[@GeorgeJFW]

Enjoyed this one alot!

[@certified-forklifter]

yeah, multimeters!

[@Venomator.]

Coolio - yet another MM... 👍🏻 How many is that now? Sorry to hear about your upcoming surgey Paul, hope it all goes well and you make a full and speedy recovery Prof... 👍🏻 😉 🧐

[@doug.a.2665]

jeez Paul ..watch out for them bloody parking lot speed bumps! ..I don't know if you have them down there in the states but up here north of the border they are "everywhere"!!..in Canada they seem to think that if they put speed bumps down in the parking lots that speeders will slow down and behave ..but NO sirree!..it doesn't work that way and some mall owners have come to their senses and realized that putting in speed bumps only aggravates the problem of speeders driving thru the parking areas ..the speeders actually speed up out of frustration and aggravation from having to drive over the speed bumps ...and then ..along comes a guy like me fresh out of the hospital who has just just had some kidney stones removed and driving a jeep wrangler to pick up some groceries ..well ..it turns into a hellish painful ordeal to get over the bumps to pick up the groceries ..no matter how slow I go ..it is excruciatingly painful! ..and then ...I have to go back over the same obstacle course to get out of there! ..I felt EVERY bloody inch of every speed bump that was in that goddamn parking lot! ..I cursed the ones who thought it was a good idea and decided to put those cursed things in there!! ..I cursed them a thousand times and wished them a thousand kidney stones so they would know the pain of what it's like to have to drive over these cursed things just to get groceries! ...so take it slow Paul and if you have a friend or relative ..send them instead to get the groceries ..I didn't have anyone!

[@learnelectronics]

I have them in the alley behind my house, they are everywhere here too.

[@MrFrazierNation]

Lol, shots fired🤣🤣 "you didn't give me a good product"

[@MCsCreations]

Really weird meter, dude. Go figure. About buying products from the US, the problem is the shipping fees. It's REALLY expensive. 😔 I buy most of my things locally or from Banggood. Anyway, get better soon!

[@sortofsmarter]

grumpy review seems to me, to be a better on point, take it or leave it this is what you get.no BS..I like it...lol

[@MinhPhamGators]

Yeah, captive screws are nice - they can't get away. :)

[@User-pq2yn]

This is a copy of Richmeters RM118B

[@circuitblog01]

You know thay are the same as peakmeter

[@yambo59]

Gotta have the AC - I would suffocate without it.

[@FlukeTog]

Well damn oops hahah wish I saw this first. Thanks I have a lot to learn and sure appreciate all this.

[@bblod4896]

You missed the magnet on the back of the condom. Feel better.

[@captainpugwash4100]

Still high as kite? All those old memories returning, White Rabbit (Jefferson Airplane), Cocaine (Eric Clapton), The End (Doors) and Timothy Leary (Moody Blues), that would be a spaced-out, groovy afternoon. Or perhaps just watch the Woodstock film again! Peace Man! Keep tripping!

[@MrFrazierNation]

Nooooooo, go back to the Probe Masters. Screw the other haters. Let them go to another channel.

[@georgechambers3197]

I like grumpy reviews, you don't hold back any. 😁 Another cheap Chinese product not worth buying. Take it easy on yourself we'll still be here to make stupid comments. Thanks for the video!

[@mauromauro1384]

nel tempo in cui è stata scritta la fiaba, e ancora oggi, in germania si vive nei boschi, la fiaba ha una morale, è quella che si deve capire, vanno a buon fine perchè vince il bene sul male è questa la morale ... è una fiaba antica, ma se ci pensi bene cambiandoci i personaggi e gli ambienti è ancora attuale, i pericoli che si incontrano oggi, sono peggio del lupo, che anzi è amico dell' uomo, quelli che da piccoli non hanno capito cappuccetto rosso, sono i lupi moderni, cioè i delinquenti ...

[@michaelpadovani9566]

El cheapo meter, agreed!

[@davidprice2861]

Obviously only reads low Ohms, most meters will read 10 MegOhms, or its just faulty. Hope it goes well removing that mongrel bastard kidney stone.

[@rooteroman]

Definitely this was not your best review... regards.

[@circuitblog01]

As for the meter its junk i ben offered to by 100 unit from china for 5 $ for a unit but i did not i did not like i

[@nethoncho]

💩😂