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What kind of Ca monitor do you think you want? My understanding is that there isn't anything practically affordable that will "monitor" your calcium. Test kits (or a colorimeter that is no easier than using the test kits) are your only option.
Don't waste your money. A ton of people have tried them and gotten rid of them. They have to be calibrated constantly, and that procedure alone takes longer then using a good CA kit (like Salifert or Elos). Check reviews around for it..
I said the same thing but not as blunt about it. From the reviews, it works more like a probe than a monitor. Even when calibrated I hear it is highly inaccurate and will fluctuate constantly in moving water. Again, no firsthand experience but seriously not worth it in my opinion.