This one worked great for telling when the air was low https://www.amazon.com/Detector-Rechargeable-Portable-Monitor-Analyzer/dp/B081PMLHRQ/ref=asc_df_B081PMLHRQ/?tag=hyprod-20&linkCode=df0&hvadid=416791939662&hvpos=&hvnetw=g&hvrand=5144634300387986031&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1013462&hvtargid=pla-871320052520&psc=1&tag=&ref=&adgrpid=90730998701&hvpone=&hvptwo=&hvadid=416791939662&hvpos=&hvnetw=g&hvrand=5144634300387986031&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=1013462&hvtargid=pla-871320052520
But this happened https://youtu.be/BSEjD6vY2PA