I use software for that. They all differ a little. I've settled on Coretemp for quick monitoring of my folding and crunching machine. you can have it display in the taskbar. Here's the laptop.
Yes but they are more for advanced users/enthusiasts because they involve installing sensor diodes between the CPU heatsink and CPU die (for most accurate reading) and in other critical locations, then running sensor wires up to the display device. The risks from ESD damage and improper re-mounting of the heatsink fan assembly are too great, IMO, for the returned benefits.
They are generally not necessary (except to view from across a room) because most motherboards already provide a means of hardware monitoring, which can then be used by programs like CoreTemp (my favorite too) to monitor temps and display that in your notification tray.
If looking for another excuse, checking component surface temperatures is certainly good justification to add a decent laser guided infrared thermometer to your assortment of test equipment. Of course, massive blocks of aluminum and copper sitting on top of CPUs tend to get in the way there but IR thermometers are great for measuring RAM, chipsets, freezers, grills, dashboards, fry pans, AC outlets, and foreheads (avoiding eyes, of course).
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