Product Description Design for measuring the AC voltage by connecting to the switch plug directly or the other kind of switch plug. It is sutable for measuring the AC voltage in many place, such as office, factory, laboratory, household and so on. No need Power. Work stable. Bright display. Low Power consumption. Over-range indication. Easy install. Product Name:ELM55-B500V Measuring Range :AC 80300V Accuracy: 1.5% FS +2 digits Consume Power :<1W(about every 1200 hours consume 1 kilowatt-hour) Plug Styple:American Style No. of Digits 3 Digits Display 7 Segment Type LCD Dimensions:56mm41mm42mm Wide Usage, More Security Are you worried about your powered accessories will be damaged by insufficient power supply to your RV? Are you want to keep the devices vital alive and save expensive repairs cost of sensitive equipment? Are you want to know whether the voltage level from campground post and generator fits to your Travel Trailer or not at any moment? Pick up this RV voltage meter to your RV traveling, save you from mess and expensive cost, enjoy your happy RV trip. Warm Tips: 1. Please keep the Children away from the product. 2. Do not use the product in a damp environment. 3. This voltage tester is only suitable for AC 50-60HZ power supply, can not be used for square wave, inverter output and modify the sine wave sine wave circuit measurement, otherwise the instrument will be permanently damaged! Have a great time shopping!