Product review (4 stars): When the units are placed side by side the readings ...
When the units are placed side by side the readings don't exactly match. The temp is within one degree, not a problem; the humidity can be off by as much as 5%, not a major problem. I'm using these units for storing potatoes, they work well enough for that. I can also use the sending unit to check temps anywhere I want; freezers, fridges, rooms, outside, whatever. They're worth the $20.00.