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sykotec's activity in the archive.
they're not amazingly cheap, but they use an ordinary phone line, keep calling til acknowledged, are battery backed... they're only meant to monitor power and temperature, but i'm sure you could interface something else if needed.
they're not amazingly cheap, but they use an ordinary phone line, keep calling til acknowledged, are battery backed... they're only meant to monitor power and temperature, but i'm sure you could interface something else if needed.