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No. Because ORP is not a measurement like temperature. It is relative to pH and oxygen levels. So in ponds we use it to monitor change, specifically, a trend in the wrong direction.
Your reef tank has a pH in the mid 8 range. Your koi pond is likely more in the 7.5 range? The temperature reading will effect potential oxygen levels and this is the most important influence on ORP in a living system.
This would also mean that the same reading in both settings ( pond and aquarium) is possible but it would mean very different things. JR
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