Do not buy instruments from this company!!!!

This company is selling a Clamp on ultra sonic flowmeter that does not work, and does not perform as per specification. The model we purchased is model F8. Not only does the manual not tie up with the flow meter, the help and back-up we got from the supplier was shocking. The correspondence in English was unacceptable. We eventually found out that the flowmeter is no flowmeter at all, because everytime the pipe would be empty and refilled again, the flowmeter had to be re-calibrated. The flowmeter never worked. When we requested a replacement unit or a refund, the request was point blank ignored. We strongly recommend not to buy any of their products based on our experience.