No — You don't need the highest accuracy 3D / laser scanner to use Imerso.
Most of our customers typically run routine construction inspections with tolerances ranging 10-25mm — depending on the object classes they're checking.
New generation devices like the BLK360 scanners from Leica Geosystems (1st and 2nd versions) deliver scan data with 5mm accuracy. These are quite affordable devices and extremely effective and fast to cover 99% of your construction quality verification needs.
Be aware that higher accuracies and capture ranges in scanning hardware come at a cost. Not just of a higher price, but also of a slower and less agile scanning process onsite. This will hamper your teams' ability to do this as a frequent routine.
From our experience, you'll get much more value from prioritising scanning frequency and agility. So that your teams could easily do it throughout the project. Instead of doing it once or twice with top-of-the-line equipment that only 3rd party experts can handle.