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It's my opinion that devices such as this give a false sense of security to the user. Of course, if that's all you require that is fine. They are little better than a voltmeter and simply measuring the voltage of the battery can be misleading.
If you want to do it properly, all you need is a multimeter and some knowledge and someone you can ask for advice.
I have done a video on my channel which shows you how to comprehensively test your battery and alternator. If you test every 6 months and write down your results, you will be able to track and chart battery deterioration. You can ask for advice via the video comments.
When the battery starts to show increased stress (eg when weather turns cold) you'll be able to know to replace rather than relying on the inconvenience of a breakdown to tell you.
https://www.youtube.com/watch?v=AT_XmlwMVz4&t=379s
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