I checked with Bob at Cyclepowermeters before actually giving it a go and it appeared to work fine for me (making sure autozero was off using a Joule, and then subsequently running a Garmin 500).
Looks like the Joule 1.0 doesn't have this feature - a shame as its £50 from evans at the mo.
@Howard started
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I checked with Bob at Cyclepowermeters before actually giving it a go and it appeared to work fine for me (making sure autozero was off using a Joule, and then subsequently running a Garmin 500).