There are lots of tools out there, some costly some not so much.
Many of the standard SEO tracking tools have now developed a level of location search.
There are two important points.
1) No keyword tracking tool is perfectly accurate, nor will two tools show the same result. There will be variances in the local packs even between a computer and phone sitting in the same spot doing the same search from the same IP address. Any rank tracking tool is "indicative" and "probable", not "definite".
2) Pick a tool and stick with it. Look for trends and confirmation of those trends in your analytics / insights.
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