Senso4s Plus Gas Cylinder Level Indicator - A Bluetooth Smart Gauge The Senso4s Plus Gas Cylinder Level Indicator is your best bet for motorhomes, campervans, and caravans - giving you super-accurate LPG level readings even on the move. Unlike those basic gauges that just aren't reliable, the Senso4s Plus can tell the difference between a moving or unevenly parked vehicle, so you can trust what it's saying. With a super-easy Bluetooth connection to the free Senso4s mobile app (it's available for either Android or iOS), you can get real-time readings on your gas levels, see how much you've used, plan for refills and check the battery status - all straight from your phone or tablet. Just pop the unit under your gas bottle, and thanks to the adjustable feet that adjust to fit just about any stee