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All I've used are the wondfos. Only problem with them is reading the line and judging if its positive or not...IMO though, I know even if its close to positive, I'm getting ready to or just have O'd. Temping can also help you confirm O and then predict O after you've been doing for a few cycles...the two used together can be very helpful. GL and make sure to read the newbie link at the top if you haven't already.
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