For the AcuRite Model 02027 Weather Station that I received, brand new out-of-the-box with both temperature sensors placed side-by-side there was a 5 degree variance in the temperature reading between the indoor and outdoor units. Even after going into the settings and manually calibrating the unit, there was still a 4 degree variance in accuracy in measuring the outdoor temperature. I called into AcuRite customer support, left my phone number on the automated system and never received a call-back. I called in again two hours later and sat on hold for over an hour in queue before customer service answered my call. The customer service representative talked me through performing a master reset, with the same variance in temperature readings after reset. The only resolution offered was for me to send the the unit I just received in the mail back to AcyRite for evaluation and repair. Neither replacement, nor refund were an option from AcuRite. I was very disappointed with the customer service experience with AcuRite. Thankfully, Amazon has a great replacement/refund policy.