The clamp on meter model 511 is a general purpose professional clamp on meter that measures up to the toughest standards. It is built into a rugged mechanical case and is designed using quality polycarbonate materials. This meter offers a complete set of measurement ranges and is in compliance with international safety and quality standards to ensure a professional and reliable measuring tool. The Model 511 is auto-ranging and provides the best measurement range and resolution for troubleshooting. It has a high resolution 40A range. The Model 511 measures AC amps, AC volts, DC volts, Ohms, continuity (with beeper), frequency (from V or A) and has a diode test function. The Model 511 is sized for a comfortable, one handed operation. This model is average sensing and designed for traditional average responding electrical systems. The jaw opening for the Model 511 is 1.575" (40mm). Standard size, full function clamp on meter. 1000AAC current measurements. 750VAC/1000VDC volt measurements. Resistance measurement to 4000 ohm. Continuity with beeper below 40 ohm. Frequency measurements from V and A. Diode test. 1ms Peak function for fast capture of signals. Hold function to freeze readings. Push-button for easy ADC zeroing. Large easy to read 4000 count display. 42-segment analog barograph. Includes test leads and soft carrying pouch. Commercial, industrial, residential and HVAC troubleshooting. Power panel, junction box and battery bank monitoring. AC or DC motor testing. Power plant troubleshooting. Electrical testing and troubleshooting on traditional loads. Dimensions: 9.53" x 2.6" x 1.42". Operating temperature range 32 to 104 degree F. Storage temperature range: -14 to 140 degree F.