Can small children's cars equipped with batteries be allowed on the train?

Hello.

Let me clear your doubts.

No problem, you can take it with you on the train.

I brought robots and electric planes to my kids, and they were fine.

Easily complete the security check.

And there are also toys with batteries on sale on the train.

Don't worry.

I wish you a good trip

You can also buy solar-powered toys, which do not require batteries and do not have to worry about safety checks.

To measure the voltage of a dry battery, you need to use a voltmeter to complete the experiment;

The voltage of a new dry battery is 1.5V, so the range selected by the voltmeter is 0 ~ 3 V;

The graduation value of the voltmeter in the picture is 0.1 V and its indication is 1.3 V.

So the answer is: voltmeter; 0~3V;