It will usually depend on where the probe is mounted. If the probe is mounted like mine along the rim of the rhp it is over the cooler part of the rhp. Rhp's will be warmest in the middle and cooler going toward the rim. So having the probe under the middle of the rhp and the tstat set to 90 will give you a cooler surface temp under the rhp because the hottest come in the rhp will be at 90. But if you mount the probe to the rim at 90 the middle of the rhp will be much warmer and give you warmer temps than you set the tstat for because now the edge is at 90 but the center of the rhp may be 100 which will give you a warmer surface temp under the rhp than you have set.
You can dangle the probe and this still applies. I hope that makes sense.
I glue my probe into a cable strap and then glue that to the rim of the rhp.
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