What is Reddit's opinion of Yosoo 9.6inch LCD Digital Sound Level Meter, Wall Mounted Noise Meter Tester Measurement Range 30-130dB Noise Tester USB Powered?

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Meh, sounds like you actually don't need smaart at all. Especially if you're not using it for TF/phase alignment. If all you want is to gauge SPL, you might be able to use something as simple as a readout like this.

Do you like to walk the room during show, or while measuring SPL? I use a handheld SPL meter in conjunction to RTA. I mounted it too a squeeze clamp with an articulating knuckle. Usually stays clamped to the console near my RTA, but I can easily grab and walk if I need to measure elsewhere, which I usually at least do during soundcheck.

I also use it to calibrate SPL in my RTA, so essentially I have 2 meters. This allows for a fast sample rate on RTA, while a slow avg on the meter. I enjoy big back-lit numbers to gauge level, or to help quantify volume with house mgmt. I have had several shows where they think it's too loud until I show them it's under 80DbC (which of course they don't fully understand). Its a good look though, when an owner/GM says it's too loud and you can go to their location to measure, and show them actual numbers to articulate any adjustments. They feel like you're both acknowledging their issue and professionally addressing the response, instead of arbitrarily arguing or placating with a "uh-huh sure".

You could also look into a pro-quality meter that measures both SPL and Freq, which would probably be the most elegant solution for your desires. I personally can't afford to splurge on such a badass tool, when I have the same functions in other gear I own. However, if I needed the simplicity to travel, it would be worth it. You can write that stuff off taxes as well. There are plenty of brands and models, but the higher end ones have lots of options like software companions, interchangeable mics, and the ability to save or record measurements like smaart.