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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: Extech EX410A  DVM  Don't Buy
Date: Sun, 06 Oct 2024 07:28:19 -0700
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On Sat, 05 Oct 2024 17:30:03 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:

>On Sat, 05 Oct 2024 14:37:55 GMT, Jan Panteltje <alien@comet.invalid>
>wrote:
>(chomp)
>>I remember the Wellers from work, had one for years at home too.
>
>I remember and like the reassuring clicking sound of the "magnastat"
>contacts.  If I don't hear the clicking, I know something is seriously
>wrong (such as the contacts welded together).
>

I think they used a Curie effect magetic path to switch the heater
contacts. Metcal uses Curie effect without the contacts.

Seems to me that a thermocouple and a heater would work as well.