The phrase "a necessary object" is correct and usable in written English.
It can be used in contexts where you are discussing something that is essential or required for a particular purpose or function.
Example: "In order to complete the experiment, a necessary object such as a microscope must be used."
Alternatives: "an essential item" or "a required object".
Indeed, since God could not help but create this Universe (as we shall see in Section 4.2), everything which is is necessary and so is a necessary object of God's volition.
This is compatible with actualism, provided that all such objects are actual in the sense of actually existing (Linsky & Zalta 1994, also Williamson 1998, 2002, 2013; it is noteworthy that Timothy Williamson independently argues for what he calls necessitism, which says [in a nutshell] that every possible object is a necessary object).
He asserts instead that this need arises "from an objective determining ground of the will" (5:143n) and, at least as argued in the Critique of Practical Reason, the Highest Good is an object of faith for us, because it is "an a priori necessary object of our will and inseparably bound up with the moral law" (5:114).
Beyond my Dickies and my guitars, I have never given the look or feel of any necessary object much consideration beyond its functionality and price.
I'm a dumb but necessary object, a passive supplier of image, and I get the feeling that I'm failing even at this.
In an emailed statement sent shortly after, Paul nonetheless pledged to "continue to fight, and if necessary, object, to continue this debate, secure a vote and force Congress to do its duty". In practical terms, Paul's protesting power is limited.
The Clean Water Act gives EPA the responsibility to oversee, and if necessary object to, state-issued NPDES permits.
To rub salt into the wound, KIC 8462852, is estimated to be about 1.5 times larger than the sun, making the necessary object vast indeed.
"The most necessary object in the world at that time: to get rid of you and get to his business, and, according to your own story, he did it".
Using ARM's Project Trillium platform, the SDK is able to make use of the mobile device's onboard CPUs, GPUs and AI chips (if available) to perform the necessary object recognition.
Technical limitations and the demand for a quantity of certain necessary objects are conducive to simplification; the reverse may be true of such an object as the bridal bedspread, for which custom dictates extreme elaboration.
