Model 561BT is a tri-axial accelerometer permitting simultaneous vibration monitoring and temperature measurements. 561BT combine three acceleration sensing elements which exhibits excellent output stability over time. The accelerometer incorporates special internal circuit in (3X)three-wire signal system which powered by voltage excitation and output with voltage signal. Excellent electrical design enables the low current consumption that ideal for wireless device with battery power supply. Signal ground is isolated from housing and internal shielded. Polarity inversion protection for the amplify circuit is inherent in the circuit design. The stainless steel construction provides a strong water-proof housing. Integrated cable is reliable for field mounting and electrical connection. Compact configuration is fit with most of the portable testing device. The 561BT provides wide frequency response, which is ideal for dynamic vibration and shock measurement especially for wireless device.