1.High Accuracy. 2.Measurement range from DN25~DN1000mm. 3.Built-in high-capacity NiMH rechargeable batteries can work 20 hours(Fully charged). 4.Can achieve measurement with clamp on sensors. 5.32K BIT built-in data storage,can store two thousand rows of data. 6.LCD dispaly can display the instant flow,totoal flow,flow velocity and working condition.