Tunkia TD8620 Gauss Meter - Page 1
Forum section: electronics / testgear

author: joeqsmith
author_rank: Super Contributor
timestamp: April 16, 2024, 12:21:36 am
content: I was in the need of a gauss meter and bought one of these cheap Tunkia. I've had it for a while now and no real issues. Searching the forum, there's not a lot of info about it. I suspect the one I have is 5% but I really have no wave to verify it. I had ordered some magnets and the meter seems to read in the ballpark of what I expect. May be a good solution if you are looking for something on the low end.https://www.tunkia.cn/TD8620-Handheld-Digital-Gauss-Meter-Tesla-Meter-pd783443888.htmlhttps://www.eevblog.com/forum/testgear/gauss-meter-(0-2tesla)-lt$150/msg3962993/#msg3962993

author: DaneLaw
author_rank: Frequent Contributor
timestamp: April 16, 2024, 02:41:08 pm
content: Was also in the market for a cheap Gauss/Tesla Meter a few years back.. there was a handful of "different" cheap models, but I was left with the impression it was mostly the casing that differed across themThey all came in 3 different tolerances 5%, 2%, and 1% - the UI & features were quite aligned.One of the things I needed, was a running peak, but they all seem to manage that.I went for this one below mainly because of the price, it seems to behave.. though I don't have reference-gear to question the readings it delivers, but they do seem consistent, and fall in line with what I expect.It's a 5% model that went for a tad under 50$ at a sale. (incl. 25% EUVAT & delivery) with hall sensor-probe & casing, so it can't be a lot that is left to build the product with.It's 5% rated in some of the range and 2% in the rest, while the more expensive 2% class, got 2% throughout the full range, and the same with the 1%.Checked the manual on this 5% unit that indicates a measurement range from 0 to 2500mT.. its 2% from 0 to 1000mT and 5% from 1000mT to 2000mTBottom of the barrel from China will have to do for now, - I certainly don't have a need to wallet out for a LakeShore F71 multi-axis Teslameter but it does look like a very impressive Teslameter.https://www.lakeshore.com/products/categories/magnetic-products/gaussmeters-teslametersModern smartphones can also get you some of the way, as they are extremely sensor-packed, but often on a limited measurement range/span.

author: Kean
author_rank: Unknown
timestamp: April 17, 2024, 05:15:40 pm
content: I've had a TD8620 in my shopping cart for a few weeks, but no immediate need other than to experiment so I haven't committed to it.Good to hear some feedback of this class of devices.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 18, 2024, 12:45:49 am
content: We have a decent meter where I work. I should take this thing in and compare it. Then again, I don't know how accurate that meter is. I know it cost a fair amount more. I saw a company selling calibrated magnets that may work for a standard.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 12, 2024, 02:38:42 pm
content: Has anyone evaluated one of these? Odd they provide no details.https://www.aliexpress.us/item/3256801821215834.html?gatewayAdapt=glo2usa4itemAdapt

author: Kean
author_rank: Unknown
timestamp: July 29, 2025, 08:59:52 am
content: Joe, did you ever purchase a TD8620?There is a bit of conversation going on about the communications connector in the battery compartment, although it appears that it doesn't do anything.https://www.eevblog.com/forum/testgear/tunika-td8620-connectors-gaussmeter/I've been in touch with the manufacturer, so if you did buy one I'd love to hear any feedback you have so I can pass it on.

author: joeqsmith
author_rank: Super Contributor
timestamp: July 29, 2025, 11:24:40 am
content: Quote from: Kean on July 29, 2025, 08:59:52 amBecause you couldn't be bothered to read the the very first sentence of the very first post of this thread, my guess is that my couple of minute blab it too much. Starts at 47min.https://www.eevblog.com/forum/rf-microwave/experimenting-with-waveguides-using-the-litevna/msg5570297/#msg5570297

author: Kean
author_rank: Unknown
timestamp: July 29, 2025, 11:41:56 am
content: Quote from: joeqsmith on July 29, 2025, 11:24:40 amOh crap, my brain just skipped over that sentence. Please don't make assumptions about people not bothering to take in what you publish, we are all human and imperfect.Thanks for the pointer to that video, I will watch it when I have a moment. I was terribly sick with pneumonia that time last year, and lost track of what you were working on. I even forgot that I had ordered a TD8620 myself as it arrived in Australia while I was in hospital, and my wife had put it aside. I only remembered about it when I saw that other post asking about the internal connectors and then had to go searching for it.A vague memory was triggered that we had discussed it here and another search found this discussion, and I thought if you had one then you might be interested in providing feedback to the manufacturer similar to what you've done with assisting Brymen.