Meters read wind where you are, not where the bullet is going. Just use the mk1 wet fingertip and mirage/environmental observation.
If you still insist, then literally ANY wind meter is sufficient and I'll sell you my nearly unused 6 year old Kestrel 2500 for a SONG (60% of retail shipped). It's the lowest end genuine Kestrel that does barometric pressure which can actually be really helpful. If you want new, the Caldwell Pro unit does a great job, is feature packed and is really inexpensive.
Honestly, you've been doing it right, learning the observational route. Bringing in gadgets is, IMHO, going backwards which is why I stopped using mine almost as soon as it arrived. I think I pulled it out 3 times before stopping bringing it to matches. Few things amuse me more than watching pro shooters spinning kestrels on ropes at every single stage and never realizing that the only condition that's changing is the air temperature.