Temp probe problems..!

[Malibu361]

OK,my Pinpoint reads 79 ,A floating glass thermomter reads 75 and my reef keeper reads 77 what temp should I go with ??I want to calibrate my reefkeeper dead on and I have all probes and thermometer at the same level...Thanks

 

[ZANYMASTER]

Trust me,the pinpoint is right.

 

[Malibu361]

its real weird I have 4 differnet readings :splitspin