ActiveTwo dual-axis accelerometer for use with Ergo input (excludes 2 required Ergo channels). This dual-axis accelerometer is great for measuring gestural energy in two directions. Specialized scaling produces an additional “Tilt Optimized” version that provides two axes of high-resolution tilt data. Applications include monitoring head motion to ensure compliance, monitoring directed head or limb motions, monitoring position of an object held or moved by participant, etc. Output is fully conditioned and scaled for use with the ActiveTwo Ergo input.