Trust apex temp probe?

[Simon Reefing]

I just set up my new apex system. I have the hydros currently on my tank. My hydros temp sensor is ready my tank at 79.3 F and my apex is reading 76. I threw one of those generic temp probes in the same spot and it reads 79.9 should I calibrate the apex probe to the hydros probe? Is it normal for them to come that Uncalibrated?

Thank you!

 

[blaxsun]

Yes, it's normal for them to be off. Get a few readings, take the average and use that on the Apex probe.