When my old Engel is running I often either need to put my hand on top of the compressor area just to check it's working. Wish I could say the same for the B Monkey, which is louder, but not too bad.
I've run my Engel at various temps and put the wired probe near the lid, half way down and at the bottom as well as the same at either end. The temperature doesn't vary more than 1 to 2 C anywhere in the fridge, so if I set it to -12, everything will freeze.
Given that I prospect in winter, Ice cream is not on the menu when camping. I stick to fruit salad and custard cold or mini steam puddings n custard hot.
Given that I'm only using the Powertech gauges for individual daily tests, I think it's range will suffice. I did look at the specs, it states it will record up to 99,999 AH. If I used 20 AH a day it would take 13 + years to get there and would probably be reset long before that, lol.
Because I have solar, BCDC and if needed a 240 VAC (generator driven) charger, the only issue I'm really interested in is, that I don't take DOC to low each day. Between solar and driving, there's no issue with the Engel and an hour of Travel Buddy oven use. Adding the BM is where the "unknown" is until I find out what it draws.
The same applies in my caravan, (main fridge is on LPG), I use about 35 AH from a 130 AH each day running the heater, TV, lights etc. That accounts for approx 25% of capacity. If I run the BM fridge in the van, and it's total load stays below 50% then also ok.
Even in winter my 200 W of solar usually take the van battery back to 100% by 1.30 pm to 2 pm most days and I still have generator or car hook up to supplement. As I've mentioned in other posts, having more than one option when out there should never see a flat battery. Unless you stuff up as I did last year.