
For the price, this is a fantastic bargain. The manuals for how to use this device are online, because this is an open source item. This particular manufacturer has a heavy metal box to hold everything in, and larger connections with which to attach coax cables.I bought a kit of connectors for this that connect to the pl259 plug for my antennas. It is so easy to tune up the antennas now with this. I have already used this a lot with the number of antennas.PROS: low cost, easy to use, Easy to calibrate and set up.CONS: the first unit came with the wrong calibration items. But the manufacturer and Revain resolve the issue immediately. Second, you have to get the operation manuals from the internet at the open-source group. However, at this cost, the pros overcome the cons.

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