I’ve got a WaterGuru. It’s pretty close to my actual tests, so I have started relying on it for most pH and FC testing. (I still manually test once a week to just have piece of mind as I can’t feel 100% safe relying on automated tests.) You can send samples of your water to a lab to have the CYA, metals, etc. tested as well.
Cost is about $300 for the device, a bit more if you need an adapter for your skimmer cover. It needs cartridges to run. 60-use cartridges are $20 each or 3 for $50. So $50 covers you for about six months once you have it. It is meant to automatically test once a day at whatever time you pick and report the results to you via phone app. I like it so far.