Heat sensors for RMH?

I'm about to start my first RMH build and will be posting here shortly, as soon as I have something to share.  I'd like to embed sensors in the heater to monitor temps for safety and learning purposes - anyone have any suggestions about this?  I know nothing about the topic, looking for links to product(s) I could purchase or more info on hot to set up such a system.  Thanks!!

I really like Auber Instruments gauges; I use them for auxiliary gauges in vehicles, but they also seem to see a lot of use in brewing applications.

Probably not the very cheapest way to fly, but a solid and flexible product; I am used to using them(with a thermocouple) as EGT gauges in trucks, where they might see 1300f..

This will only get you a display and an alarm... it won't get you temp logging, that would be a different piece of tech entirely.

Thanks for the reply D!  Are you referring to something like this one below, on Amazon?  It doesn't specify, but I'm guessing it only accommodates one sensor?  Do you know of any model that does three sensors?  And I suppose I would need a wall adapter to use it on AC?

https://www.amazon.com/Automobile-Multimeter-EGT-Boost-Red/dp/B00BFF7UO8/ref=sr_1_2?dchild=1&keywords=Auber+Instruments+gauge&qid=1600959878&sr=8-2

Just found this one, which is dual channel.

https://www.amazon.com/Auber-Instruments-Channel-Automobile-Multimeter/dp/B00JXUVEMQ/ref=sr_1_5?dchild=1&keywords=Auber+Instruments+gauge&qid=1600960906&sr=8-5

Is this the type sensor to use?  

https://www.amazon.com/Vktech-Thermocouple-Temperature-Sensors-Exhaust/dp/B009HW44F4/ref=pd_bxgy_2/144-1707541-2267809?_encoding=UTF8&pd_rd_i=B009HW44F4&pd_rd_r=520805ec-cf2c-4c8a-bc31-ae71ffbf2573&pd_rd_w=dbJ4q&pd_rd_wg=E9J88&pf_rd_p=ce6c479b-ef53-49a6-845b-bbbf35c28dd3&pf_rd_r=79YQ82CDJW1YXD55Z8TY&psc=1&refRID=79YQ82CDJW1YXD55Z8TY

the multi-meter description doesn't specify what type of terminal.  The one above has terminals that screw on.  The one below has a 2-pronged jack:

https://www.amazon.com/Thermocouple-Exhaust-Probe-Exposed-Connector/dp/B07K713G1S/ref=psdc_5006547011_t1_B009HW44F4

Also wondering if the second one is higher quality.  I'll be burying these in the RMH and don't mind spending a bit extra for a quality probe as I won't be able to replace it if it craps out.

And one more question - does anyone know of a more out-of-the-box product?  One that I could just plug in to AC, without having to wire up to an adapter?  I'm sure I can figure it out, but I got a on my hands with finishing by my RMH and an addition before it gets cold!

Hi Mark,    I have not used temperature sensors other than an infared point and shoot gun and a candy thermometer stuck in the exhaust stack.
I do remember though that Matt Walker was asked "What are some good affordable temperature sensors" in Stove Chat 7 around the 49 minute mark. Hope this helps.

I have been buying mine direct from Auber, https://www.auberins.com

I have used K type thermocouples from them, and cheap ones from ebay; no issues with either so far.

The dual channel has the same type of terminal as the single; screw clamps which work with bare wires or u-shaped fittings.

The thermocouples generally have a U-shaped crimped fitting that fits these terminals.

Yes, you'll need an adapter from AC; 12v is a pretty common voltage, should be possible find an old wall-wart from a router or something..

Thanks for the replies!!!