At a minimum I would get a Thermapen MK4. They are pricey but are pretty much the gold standard in temperature measurement for cooking, brewing, etc. (pretty much any time you need fast, accurate measurements). They are having a closeout sale on one model now.
Specializing in cool, unique and professional temperature tools. Super-Fast thermocouples, thermistors, infrared thermometers, data logging and more.
www.thermoworks.com
Beyond that I'd look at something like a FireBoard 2 or similar. Fireboard is very popular here but there are many options from Thermoworks (makers of the MK4), Weber, Inkbird, to name a few. These are great because it adds bluetooth and/or WiFi monitoring along with multiple probes so you can monitor both pit temp and multiple meats. Some have very good apps to record graphs, notes, etc. for each cook if you geek over that type of stuff.
The way I look at it, and this is a bad analogy but I'm going to use it anyway, is its like floor mats. I bought a $60K truck with shitty floor mats and the first thing I did even before I got home was order WeatherTech front and back because I wanted something that actually worked. Traeger probes are crappy carpet floor mats and the other tools available from 3rd party vendors are significant upgrades that are industry standard and accepted as "just the way it is".
What ever you do...from one Colorado griller to another...good luck!