PORTABLE METERING KIT - 50 AMP - found at - Utility Supply Group 

This item works well when used with any Manufacturer's Pedestal or Surface Mount Box.
Use this Item to temporarily meter a site or to check an existing meter at a site.

Complete PORTABLE Add-A-Meter Kit.  Digital Electric Meter, 125 Amp Socket Assembly, B10 Hub, 1 Inch Close Nipple, Meter Ring, Closure Plug, Padlock Seal and Pigtail with a 240 Volt, 50 Amp Plug.  All Parts Needed to  Add A Meter To Existing Installation except Mounting Board.

Utility Supply Group offers this Portable Meter Kit Complete for use on any manufacturer's Surface Mount Box or Pedestal.

Utility Supply Group's digital electric meters come refurbished with a 3 year NO NONSENSE WARRANTY. (USG's No Nonsense Warranty pays freight both ways, getting your site back in operation quicker)  This meter has an odometer style reading for a hassle free read everytime.