I realise I am probably a peasant, but a peasant who has been tracking my own bio-markers since diagnosis. Mod cons and devices are wonderful! But my belief, for tracking fat on your body (and visceral fat absolutely included - and I say that as a normal weighted person for over 9 years) - is one does not need to go mod con and expensive devices to track fat deposits. I totally understand the joy and interest in it though! And for those who are using these devices and apps and so on - it's terrific that you are sharing this information. Bio marker tracking can be very engaging, and helpful when trying to get better with type two diabetes at least.
I just want to give my closely tracked

two cents worth for any other peasants who might be worried about adding up the cost of helpful body-fat tracking. And still want to do it.
What I use and have been using since the get go - plain-old simple old-fashioned tape measure, my fingers method (pinching the skin to feel for fat deposits), and last not least - the mirror! And viewing recent photos I find to be
very reliable. Plus clothes - whether or not they are tight fitting, or loose, or unwearable, or so loose need new closer fitting clothes. (the latter has happened but not as common as the tight fitting thing!) These are the methods your great/great/ grandmother would have used (minus the selfies/photos). I have found them to be excellent for my own tracking purposes

.
What am I measuring? For me, it's waist and hips. As I was, and am, a belly-fat-first person. At the same time as fat collects majorly on my belly, it also collects on my neck, face, and back and sides, then last - on my legs, but absolutely there last. The prescious organs though - heart, digestive system, liver and pancreas, are first to get the fat deposits, apparently.
If you want to go deeper, but still cheaper - all the biomarker measuring sites online that I have used, have good further measuring methods. My favourite tracking site is health-calc.com. But OECD countries' state health care systems have them too - my own home country's is pretty good - I just prefer the great graphics and useability of health-calc.com.
Hope this is useful for budget constrained and/or fellow peasant-ish type two diabetics, with the body types that can lend themselves to insulin resistance based diabetes, at least.