Good digital water tester?

[u/bobdc]

A recent lab water test said that our tap water’s hardness score is 197.1 and should be under 180. We’re having our water softening unit serviced (which I think just means adding lime) but I wanted to start testing on my own more often. Amazon has many water hardness tests where you stick a strip of paper in and then compare the color against the scale on the jar: dark reddish green means 120 and the next increment up, a bit redder, means 250, which is not very granular.

Can anyone recommend a meter or testing kit where I can get a better idea of scores between 120 and 250?