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I don't know for sure but I think it is not there, here is photo of the back https://ibb.co/pjHdsYN This is the device I got initially from you and runs Espruino, I have another one bought directly from SMA (later in the same year) still running original firmware. Both are probably same old "pre-kickstarter" models without hole and older VC31.
So you don't see it when trying two devices - one with Espruino with Heart Rate Monitor (v0.11) app and one with SMA firmware on each hand?
fanoush
@Gordon
Stupid question, but have you removed the protective film from the HRM? That could be messing readings up a bit