I love this tool. It is easy to install and has simplified the blower door experience. Only takes a minute to get used to the controls and by using with an I-Pad capturing the digital image of the reading is fast and easy. It is a bit of a battery eater but we are trying rechargeable batteries and so far are having good success. We have run a second manometer without wifi a few times along side the manometer with the wifi just to verify the readings we are getting are accurate. So far so good. This is a must have product if you run blower doors or any pressure pan testing. For CAZ testing, it has been great to carry around the I-Pad (leaving the manometer with the TEC WiFi Link hooked up in the CAZ) while testing door positions and turning on fans. You can see the changes immediately on the TEC app without having to return to the CAZ each time.