The HAVi (Hand Arm Vibration Indicator) is a simple, effective product enabling a cost effective solution to Hand Arm Vibration exposure management. HAVi can be programmed easily without the use of a computer or software. 100% waterproof and dustproof. Includes a visual warning system. Attach the HAVi directly to a power tool through the use of cable ties or strap. Has up to 1000 hrs working life.