PerfectPrime AR1890P2, Digital Air Pressure Manometer to Measure Gauge & Differential Pressure ±13.79kPa / ±2 psi / ±55.4 H2O with pair of 304 Stainless Steel Static Tube 5.13" x 2.34" Length

all good

really useful for quick checks on differential pressures.

This item might work well but there are no instructions that come with it.

It did the trick with balancing my new HRV!

only a quick manual comes with this product and it includes absolutely zero details about this specific product. There is a section in the quick manual for downloading "the full manual". I scanned the QR code and landed on perfect primes manuals section, which did not contain any information about a digital manometer. it had listed many of their other products so I sorted through the list to be sure. I don't know how the company would expect you to use a product when there's absolutely no place to download the manual for it, and it's not included.