- 4 jaw, lever bypass, 200A, ringless
- Ring vs ringless. Ringless has a cover installed at end, after the meter - for visibility of potential short circuit such as a 'wrench in the machine.' . Otherwise, locking mechanism is clear and you can't tamper with meter once locked.
- Some designs have bypass. Horn or lever. Ameren requires lever? Horn bypass are $200 cheaper. 
- Large or small hub. Small hub at menards - 
- 5 jaw example? 
- looks like 5 jaw