expression, adverb
both in quality and quantity
Used to emphasize that something excels or is sufficient in both aspects—quality and quantity—often in formal or written contexts.
この製品は質量ともに優れている。
This product is excellent both in quality and quantity.
彼の研究は質量ともに申し分ない。
His research is flawless both in quality and quantity.
A more explicit separation of 質 and 量 using a dot, but essentially the same meaning and usage.
Compound of 質量 (quality and quantity) + ともに (both). The phrase is a straightforward combination of its parts.