Dubious items for sale at Thai fair

Seen at a fair in Ao Nang, Krabi:

Looks like an old model phone.

Hey, what's that at the top, not the antenna..

ZAP!!
Push a button on the side and it functions as a 100,000 Volt taser.

A pocket size scale for weighing ?gold?

Obviously not, and these items are not for junior chemistry experiments. Seems they are useful for  users of cocaine, heroin, ice and marijuana.