Tracking paid ads with Nozzle has some challenges.
In almost all cases, Google does not display your ads every minute of every day when your keywords are searched for in the SERPs.
This means that sometimes, when Nozzle pulls your SERP, there will be no ad data to collect.
We can only report SERP data that is present at the exact time that we capture the data.
You can verify what our tool captured that day by drilling down to the Single Keyword dashboard for any keyword for which you know you are paying for ads. On that page, scroll down to the SERP Snapshot (Nozzle Vision).
You then can see whether or not an ad was present when we extracted that particular SERP.
You can also select and analyze any date from the gray drop down right above the SERP visual.
If the time we captured the SERP and the time that Google displayed your ad happened to line up, you'll see it there. However, if they didn't, then you won't see your ads in Nozzle for that day.