Low cost Chinese Voltage - Resistance - Source Single PCB = Waste of money

[Kiriakos GR]

Anyone with the dream of buying for cheap, Voltage & Resistance source at single PCB, in the end, he does waste his money.

At modern times, the use of surface mount components at multimeter manufacturing, this gave them the benefit of significant measurement stability, over time.

Many poor people, they also describe these Low-Cost Voltage - Resistance – Sources, as then to be a voltage reference.
This is a huge mistake, because a true voltage reference this is never sold without housing.
This is never sold without calibration report, this signed by a well-known lab, lab location western hemisphere.   

The biggest customers of such poor quality, Voltage - Resistance - Source Single PCB, they are Kids, which they also buy DMM, from sources of lowest reputation.

A true voltage reference, this is for inspection of bench-top multimeter with accuracy tolerance 0.0040% ~ 0.0025%.

My GOLDEN advice, you better add the amount of money spend for toy sources, at the price of your next handheld multimeter.

Most multimeter sold due western hemisphere, they have been inspected of not containing dangerous chemicals.
They are easy to buy and easy to return within 24 months warranty period.
They are double inspected, regarding measurement stability.

[Andrew-88]

Personally I do skip on YouTube watching of any video, this including a demonstration of accuracy test, due these cheap Voltage & Resistance PCB.

These days most people playing with a multimeter at testing it, rather than using it as a reliable tool.