For those who like to monitor everything imaginable: Hot tubs, multiple rooms, aquariums, dry-boxes, greenhouses, fridges, 5-in-1 weather station. You might have used up your quantity 10 (ten) sensor limit on your SmartHUB 09150M hub. WARNING: you only have 7 (seven) allowed sensors for the Acurite Access 09155M hub that Chaney Instruments wants people to upgrade to!!!! My 09150M to 09155M transition went smoothly, until I was missing some sensors and found out about this limitation. What is Chaney trying to accomplish here with such a crippled upgrade? Also, note the new 09155M hub is missing a convenient "sensor transfer" LED status (a minor negative), supports built-in 3xAA battery backup (a nice positive), and has a Google Home micro-tower look (for those who care).