I'd add a newtek/alife to the list of exceptionally poor ones. And second the zoo med 500r and the worst.
I have done a bit of poking into ranco and johnston and the question I have is are they using a resistive probe or a thermal coupler to set the temps? The cost difference is substantial even for large volume orders and I can't see anything using a coupler in the price range of the either. Resistive sensors typically have a 2º accuracy (and cheap digital temp devices are the same)
If you set the temp to 88 it could be with a properly working devise 90 or 86. I don't know if either uses resistive sensors but Helix Herpstat Ecozone don't use them. I don't know anyone whom is using a ranco / johnston whom has an accurate (0.5º error or better) thermometer to check.
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