Hello sir,
I'm an expert in this field, and wanted to ask a few questions to see if I can recommend some of the metering devices I'm conversant with (quality ones).
1. For the meters that meet your conditions, when you specify "low cost", what is your budget?
2. What is your mounting arrangement?
3. What if your preferred connectivity protocol?
Then I'll recommend a few options for you to work with.
Regards,
Benedict.