Review on 📱 Testo 550s Kit: App-Operated Digital Manifold with Bluetooth, including 2x testo 115i Pipe Clamp Thermometers, 1x testo 552i Micron Gauge, and a Set of 3 Hoses for HVAC Systems - Black by Chad Judex

Basically a simple hardware upgrade of old 3 port Testo 550 and 549 collectors. I don't think they have as long a battery life as the old sensors but that is probably to be expected when you upgrade your screen and processing power but still run at 4x AA. One thing I want to throw away: DO NOT buy them hoping to use refrigerant probes with this manifold; they don't connect. The only sensors that will work with it are the temperature sensors (both air and pipe) and the vacuum sensor. That little tag aside, disappointment aside, this distributor is fantastic at what it does and if I had to buy it again in a heartbeat if I had to.