1.Beware of slippery when using. 2.Place it on the flat hard ground for first use.(Do not place it on the carpet or soft product for measurement. Avoid the affect of accuracy.) 3.Remove the protective coat before use. Follow the instruction to set the par and stand on it with naked feet.4. The product is precise instrument. please don't jump or stread on it too hard and handle with care.5. The product is for domestic use. please don't use it for business.6. Please take out the battery if long-time no using.