I used to have a rotating field meter, but it was cheaper. I was at work and needed it ASAP and that was all I could get in the shortest amount of time. I once considered reforming when I had the opportunity and turn to Fluke for gauges and related equipment. I bought this and use it mainly when commissioning industrial power supplies and I need to check the rotation when the customer turns on the power. your new gear. I also use it a lot when the customer is also connecting a generator and we need to make sure the generator is connected in the same direction as the utility. These phase rotation meters are as simple as it gets. Just connect 3 wires to the corresponding phases A, B and C and you will get a rotation reading. I've never had any problems and that's what I expect from Fluke. They have never let me down and I trust them very much.