Two stars.Product is not calibrated properly, has to be plugged in, no battery powered option and even when you buy the 5 gallon kit they dont give you a longer hose so your struggling to find the right size at home depot or some hardware store... Of course it seems to be a slighly off size.Two stars because they tried by sending me another one but both I got hit with heavy import charges into Canada one of which ups sent to collections without even notifying me I had a bill!But ultimately the products quality control sucks, its not calibrated and there is no way to calibrate it so its half junk.