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Alf0nse-
The accuracy of optical sensors is improving, but it’s still behind the sensors used in a decent chest strap.
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What I've been looking at are optical bicep straps and they are meant to be very good and way better than wrist based sensors. Don't know what one to go for just yet but probably the wahoo
andyp
Retro_Bastard
If your wrist strap is that far out I'd say that makes it pretty useless and going by breathing rate or just perceived rate of exertion would probably be more accurate than that. What one are you using? I'm looking into some of the arm based straps at the moment as i find the chest straps get uncomfortable when i get very sweaty.