44khz is way too slow. You want 100khz or better.
Realistically, you have 3 or 4 options. Options 1 and 2 are used analog meters from the 60s-70s, the b&k 2209, and the Larson 800b. They have their quirks, they need maintenance, and they can suddenly fail, like 50 year old gear. You can build your own system, there are components from Texas instruments and other data acquisition companies that would allow you to build and program an accurate system, this can cost about the same as getting a used meter, or maybe a little more. Or, you can buy a pulse from b&k, turn key 192khz, huge range, accurate, reliable and repeatable, downside, they're 50-60k depending on options and other supporting components and software.
Many suppressor companies and dealers have 2209s, and they work well, most of the time. A few companies have built their own systems, again they work, but they're harder to quantify, the specs and reliability of the data are pretty much limited to the credibility of the company. The pulse is on another level. It just makes everything so easy, and it's so repeatable.
Any more questions, just let me know