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(Click the pictures for reviews & links) 


Yi 2 - Best Budget 4K 

Gitup Git2 (My Pick)

Xiaomi Yi


DR02 D - Best Budget Dual Cam

Yi Ultra 2.7K
Mobius (also works as a Dashcam)
Polaroid Cube+
Drift Ghost X

My favourite USB battery power Pack

This is the excellent USB power pack I use when I travel.

2 x 2.1amp outputs. 8400mAh capacity.

Two digit Led display shows battery level


What SD CARD should I buy?

If you want an SD Card for your camera - these are the ones I use and recommend. 

I'd strongly recommend not to buy any SD cards off ebay - I've heard about too many issues with counterfeit cards - often sold on by unwitting resellers. My inbox regularly gets messages from people who bought a £150 camera then cheaped out and bought a £3 memory card on ebay - Then when it doesn't worth they blame the camera! It doesn't make any sense. Good memory is cheaper than it's ever been - see the links above.

A lot of HD cameras will not work properly with cards larger than 32GB (cards over 32GB are usually SDXC rather than the SDHC standard used by 32GB cards. SDXC cards use the ex-FAT system rather than FAT32 - in short they are a different standard). - so don't just buy the biggest card you can afford - read the specs in the manual to see what it accepts.


RECOMMENDED CARDS (for action cams - see dashcams below)

CLASS 10 UHS-1 CARDS (For HD Cameras)


U3 CARD (For 4K cameras)




The SD card in a dashcam is re-written over, more frequently than in other types of cameras. Some manufacturers void their guarantee if an SD card was used in a dashcam. So, no surprise, there are special High Endurance SD cards made just for's some.


VERY IMPORTANT. These links take you to the product, however Amazon have three different ways of selling. There's Amazon Direct - This means that you are only dealing with Amazon themselves, then there's other sellers that use Amazon's facilities - these show as Fulfilled By Amazon and finally there's Market Place sellers that advertise on Amazon, but operate independently.  I strongly recommend that you only use the first...the Amazon Direct - Sold By Amazon option. Even if it appears that you are paying a couple of £/$ more it is more than likely you are comparing the price of a real item against the price of a fake.

To give you an idea of the extent of the fake goods problem. In a 2016 survey by Apple - 90% of the 'Apple' chargers sold through Amazon - using the other the two methods..which includes the "Fulfilled by Amazon" option -  were found to be counterfeit....90%! 

« Show 'N Tell | Main | The Record Runner »

Random Number Machine

In this quick video I take a look at a stand-alone random number generator that uses Nixie tubes. The ebay advert for this suggested that the buyer could gut it for the tubes. When I saw that I knew that I had to rescue this unusual little piece of electronics history.   

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Reader Comments (5)

That's really interesting! :D

March 29, 2018 | Unregistered CommenterDominik Galuszka

I have seen more modern versions used in several settings, one as you indicated lotteries could certainly use such a machine. However when I was studying for my CPA, the professor in the auditing class advocated using a random number generator for picking samples. So you'd apply standard statistical models to a achieve a desired confidence level and reliability level for a sample of population N, n so lets say you had a 10,000 checks and to achieve your random sample of 120 checks the right number for some confidence level you then enter the starting and ending number for the total population and then press the button to get the check numbers you would go investigate.

This approach to do that was replaced fairly early in my career by computer programs that could do all the work. Several articles were written proving the number generators of the early programs weren't truly random a pattern could be picked out but the solution for that was demand a seed number to start the programs search. Presumably the pattern was still not truly random but so long as the client could not realistically no in advance what numbers would be selected it wasn't really an issue. Most of us used an even more basic approach we would have a declk of cards well shuffled you'd pull a card and count that interval between checks to be pulled again not really random but random enough to isnure the sample was likely to be a good cross section of the checks written.

March 30, 2018 | Unregistered CommenterMarty Lampner

The random number generator might have been used for picking a fair sample of products from a storage area for verification/certification See:

March 30, 2018 | Unregistered CommenterEdward Mróz

98! I got it!

April 1, 2018 | Unregistered CommenterRichard D

Bit late watching this one but I also chose 98. I suppose for every 100 people seeing this video one person is going to be right, or doesn't it work that way?!

May 8, 2018 | Unregistered CommenterChris E
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