Advice on therm/Hyg

[MarcaineArt]

I'm thinking of getting this at amazon

Ambient Weather WS-0101-COMBO-KIT Wireless Thermo-Hygrometer with Three Remote Sensors

It has 3 sensors so I figure one in the hot end one in the not so hot end and one in the hide would be good. My question is on calibration.
It says it can be calibrated and they sell two calibration kits, one for 33% and one for 75%

Question is which kit or do I need both?

 

[ascott]

I have absolutely no idea...but wanted to post to give your thread a bump...ready?...BUUUUMPPPP

 

[MarcaineArt]

Wow I thought there would be opinions on this one.