Review on XtremepowerUS 4CFM Air Vacuum Pump HVAC A/C Refrigeration Kit AC Manifold Gauge Case Set R134a Tap with Leak Detector + Carrying Tote Bag - Premium Quality by Mike Wallace

Overall 4/5 stars. I would say that the price is good, the price is comparable to most other brands (they all seem to be from the same Chinese manufacturer). Quite a saving compared to a professional gauge set. I used the kit once to diagnose a problem with a car's air conditioning and then topped it up with refrigerant. I can't judge the accuracy of the sensor as I don't have anything to compare it to. Pros: Gauges are easy to read, handles on the connection ports (where you connect to the vehicle) are metal. 4. Connector and valve - intended to connect and keep the vacuum line connected while still allowing refrigerant to be charged. Cons: The handles on the valve, which is mounted on the pressure gauges, are made of plastic. The plastic case is mostly junk, good luck getting your sensors and all the leads (hoses) back in after the first use, which is what you're expecting for $70. Biggest minus: O-rings at the junctions of the lines and gauge set are hard white plastic. Lines tightened by hand as they should come loose VERY easily, shaking the coolant more than once can loosen the connection and trigger coolant pain in your back. I'm convinced it's the cheap hard plastic o-rings. Tightening them with pliers (which you don't have to) kept them taut, but at the cost of permanently damaging the hard plastic o-ring, rendering them unusable once you unplugged the lines and put them away. I read the same complaint in other reviews and didn't realize how important this point is. I had to order a set of rubber o-rings, so another $11, to get this thing to seal properly when hand tightening the line connections. I recommend replacing the white hard o-rings with rubber o-rings before first use.