Tremor may be intermittent or constant. It can occur on its own or it can happen as a result of another neurological disorder. Tremors can be classified into two main categories, resting tremor and action tremor. A resting tremor occurs when the muscle is relaxed, such as when the hands are resting on the lap. This type of tremor is often seen in people with Parkinson’s disease and is called a “pillrolling” tremor because the circular finger and hand movements resemble rolling of small objects or pills in the hand. The intention tremor is produced with purposeful movement toward a target, such as lifting a finger to touch the nose or moving a leg to kick a ball. The easy-to-use three-axis accelerometer ADXL335 from spurkfun.com is recommended. In hospitals the clinical equipment has isolated grounds that prevent the passage of AC or DC current from such equipment to the patients.