Why the old P51 pick changed
The manufacturer marks the old P51-870 variants discontinued and points buyers to TITANMAX. For an existing P51 owner, serviceability and firmware support may still matter. For someone assembling a new kit, we prefer to start with the current platform and an identifiable configuration instead of treating leftover stock as an unqualified premium recommendation.
Buy the interface you will actually use
A large screen is only a benefit if the arrangement of information works for you. Think about where the manifold sits, your usual viewing angle and the conditions of the job. Our recommendation is based on the documented interface design. A claim that it is faster or easier than competing meters would need hands-on comparison.
Data logging is a process, not just a feature
A useful commissioning record needs a clear job reference and the conditions under which readings were collected. Decide where the record should end up and who needs to read it. A platform with export options can support that plan, but it cannot independently ensure that the information is complete or meaningful.
Check the whole connection arrangement
Valve count, supplied sensor and hose configuration should be considered together. Do not infer the contents of a retailer's bundle from this model family alone. Match the seller's exact part number to the manufacturer specification and confirm the components you need. Follow system and instrument instructions for compatibility and operating limits.
Compared with the Fieldpiece and Testo choices
Choose among these platforms around your existing tools, display preference and normal service routine. TITANMAX is our touchscreen candidate; the other options remain useful where their ecosystems fit better. We are deliberately not giving an invented performance score or claiming that a more elaborate interface guarantees a more accurate diagnosis.