You are looking at a Custom-made plug-in AC 6 in 1 multimeter.  I hand built this product only because nothing like this is out there.  Its general uses could be used on an RV or anything with a TT-30R receptacle plugs.  The number 1 reason I wanted this was to know the Watts used by my RV so i would know what size generator I would need to run my RV.  You can see from the photos that this device reads not only amps but watts and many more.   If wanting to use in any other application where 120V is used you can simply buy electrical plug converters.  The length which would be added to wire length if plugged in line would be about 48 inches.  When this item was hand built, I solder all electrical connections and then used heat shrunk, metal electrical box where meter is installed is sealed with all watertight connectors.  Item will work outside but I would not recommend keeping outside in any possible location where it would sit in standing water.   You can see in my photos where I plugged inline with a toaster oven and you can see the differences in load from no load to single side and then dual sides.  Below you can see more detailed specs of what the range of the meter can display.   This item will not work with a generator.

Specs of Multimeter:

Measurement Ranges --- Voltage AC 40.0-300.0V, Current 0-100A, Power 0-30,000W, Electric Energy 0-99999kwh, Frequency 45.0-65Hz, Power Factor 0.00-1.00PF.

6-IN-1 Multimeter --- Detect and Display Voltage, Current, Active Power, Battery Electric Energy, Power Frequency and Power Factor on a single Interface

Data Auto Storage --- When Power Off, the Electric Energy Data Will be Stored and Memorized Automatically, can be Reset from the reset button on front of screen.

Note --- This Meter can only be used for Measuring 50-60Hz Pure AC City Electricity, it will be damaged if used to Measure Square Wave, Inverter Output or Modified Sine wave Circuits. 

Everything seen in photos are included and are the actual product you will receive.  If you have any questions or want to see any other photos, please email thanks and Happy Bidding.