Before any gauge
Start by getting permission to shut the water off, identifying the device, confirming flow direction, and using the local water supplier or state method if it differs from the handbook. For a blank record, see record blank, and use device notes to save what you observe.
What the guidelines check
The 2003 EPA manual describes an RP assembly as keeping the zone between its two checks at a lower pressure than supply, opening a relief to atmosphere, and using test cocks and shutoff valves. It also describes three checks: the first holds a differential of at least 5 psi, the second holds against backpressure, and the relief opens below inlet pressure at a minimum of 2 psi. USC FCCCHR notes also say the first check reading must be above the relief valve opening point and at least 5.0 psid.
Where the pictures live
If you want the paraphrased layout beside your notes, open RPZ test report and the glossary for terms used on the page. The field pictures and gauge views are summarized here from public manuals, not from any Backflow Record result.
Not a result from this site
Backflow Record stores a backflow test report as a record you fill in. It does not perform the procedure, and it does not replace the water supplier or local program instructions.
A report in Backflow Record is a record you fill in. It is not a substitute for a licensed tester or for the form your water supplier requires. It does not report an inspection result, and it does not mean a plumbing rule was met.