I have this one too. So far so good.I bought Meade version of the Honeywell TM005X from Amazon. The base unit comes with 1 remote sensor and I purchased 2 additional remotes to test and keep the most accurate one. 2 days of testing and all 4 sensors (base unit also takes readings) are at 75% so I ended up keeping all 3 remotes. I paid $65 including shipping.