To choose the meter, there are few parameters to consider:
First, is it a :
Option A - Whole current meter (aka direct connect)
A whole current meter is where the electricity supply passes through the meter itself. Typically used for loads up to 100 amps.
Option B - CT (Current transformer) driven meter
CT meter is where current transformers are used (Read more here). CT meters are typically for larger loads than 100 amps.