instrumentus-1.21.1-2.8.9.jar is a release file of the Minecraft mod Instrumentus for NeoForge, made for Minecraft 1.21, 1.21.1. It was published on April 11, 2026 and is 2 MB in size. For the full description, screenshots and every other version, visit the Instrumentus mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
