Sounds silly to me. If you perform weekly water changes you shouldn't need something to sound an alarm when your water is at dangerous levels. You could probably tell by the gasping fish before the alarm went off.
Water changes, water changes, water changes.
You shouldn't add chemicals to a tank to 'fix' water parameters. Chemicals are bad. You have to fix the cause, not treat the problem.
In other words.............an enormous waste of money.
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