I've found the SC models (I had the Beta) to be overly sensitive to lighting conditions. I began using the diffusers all the time no matter the lighting conditions and while that helped I still got too many error messages. The accuracy of the SC Beta I had was always good when I got a reading though.
I've never used the Pact models but I've found that the ProChrono Digital is a very good, reliable instrument. Much more reliable than the SC was.
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