I'm especially interested in computing devices like laptops/smartphones and vehicles like cars and trains.

  • This is a really big deal. Most of them aren't waterproof, so once they're tamei they're permanently ruined for any purpose that requires them to be tahor (e.g. infrastructure of the Beis Hamikdash, or kohanim driving home from the mikveh to eat terumah). – Heshy Mar 13 '19 at 16:40
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    all metallic devices are suceptible to impurity. only kle even and pshute kle ets don't mekabel tuma – kouty Mar 13 '19 at 17:20
  • Not everything is made of metal. Some are made of plastic. Even those that are made of metal are made of composites, which are subject to a Machaloket Acharonim. – MDjava Mar 13 '19 at 17:44
  • @Heshy More and more are waterproof (for several years now). – DonielF Mar 13 '19 at 17:44
  • @DonielF not cars, as far as I know. And they're typically going to become tamei midras pretty quickly. For mikdash phones, yes I agree the gizbarim can just get waterproof ones. – Heshy Mar 13 '19 at 22:00

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