No worries.
Pulse-no idea, but I haven't got it.
I connected it up, didn't turn the water on, took a picture of it with a time/date stamp (electronically on iPhone) showing it at 0.
Then take a picture once a month on the same date showing water usage.
I assume you're metering to lower your water bill. This will leave a trail of proof to the water company. Had mine fitted for 6 monthsish but not got the rebate yet.