Installed a dual sensor unit on my yacht in June 2018. One sensor on the engine block the other on the exhaust. The temperature changes are immediate and easily monitored to indicate any sudden change after running temperatures are reached. The alarms are set 5 degrees above maximum temps reached over time. This device takes the guess work out of critical engine temps resulting in less anxiety while motoring. I would recommend that every sailing vessel and motor launch should have one of these devices for peace of mind and trouble free motoring.
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