Total control with Rombo-III. This multi-use-case IoT device is able to monitor most of the cases you can think of. Measuring the conditions of a battery, broken cables, digital and analogue signals, temperature, humidity and light intensity. Besides just reading information, Rombo is also able to switch his 2 onboard relays.
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Rombo - III All Purpose Asset Monitor LTE-M/NB-IOT -20...+65Price on request