No, no, no! When you set an alarm function, either a meat probe or pit probe there is an option to set just a max temp OR A RANGE. If you select the range you can have upper and lower alarms. So for example, if my target temp is say 325* i can set a mininimum at 300* and a max at 350* and get an alarm for either. And, on the data graphic, you see the min & max lines with your actual performance (hopefully inbetween)
I've been using one for about a year and really like it. I've actually had pretty good experience with the Bluetooth through windows and walls. Routinely set up my pit in the driveway and catch naps in the living room recliner or spare bedroom, about 50-75 feet through concrete block with Hardie board exterior and drywall interior.
I have not tried 2 units, would really like to know if that works.