The phrase "a very effective device" is correct and usable in written English.
It can be used to describe a tool or method that achieves its intended purpose successfully.
Example: "The new software update includes a very effective device for managing user data more efficiently."
Alternatives: "an extremely useful tool" or "a highly efficient mechanism".
Thermal regenerator systems are very effective devices for the abatement of volatile organic compounds (VOCs), mainly in industrial processes with high flow rates.
Concerning about surgical procedure, the vessel-sealing system and endovascular stapler are very effective devices for dissection and devascularization of collateral vessels and splenic hilum, but the usage of them could not lead to surgical outcome in some cases.
If longer-term therapy is thought necessary, there is a very effective intra-uterine device that is coated with progesterone, the LNG-IUS, (Mirena).
In conclusion, the SurePath broom appears to be a very effective cervix sampling device when coupled with the SurePath Pap.
A Gentle Leader is also a very effective, highly humane control and correction device which is much better for you and your dog than a choke chain.
This can be a very effective way of making the two devices work in concert with one another, but it adds another level of complexity to the already significant complications of the the user experience.
The government's supporters point to research showing that nearly one-third of women would change their contraceptive if cost were not an issue; a very effective means of birth control, the intrauterine device, can cost up to $1,000£60000).
For instance, the LizardStresser botnet captures its targets by attempting default credentials on devices it finds on the Shodan search engine, which happens to be a very effective tactic because most consumers forego changing default factory settings on IoT devices.
