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IMPORTANT!- Please read the instructrion or watch the video first before order and please note that this digital measuring tape Might have ±0.35inch different depends on your rolling method. When measuring objects, please keep the roller moving at a constant speed. For some smooth surfaces, such as tiles, this product is not suitable for use. Multi Measuring - Linear measurement, circular measurement, arbitrary curve measurement, irregular surface measurement, cylindrical diameter measurement, accumulation/subtraction of 10 historical records, measurement prompt sound, measurement breathing light , Unit switching. Easy to cover your daily measurement needs. Rolling Electric Tape LCD Digital Screen - Rolling whatever you need to and you would easy to read the result from the LCD. Worry free from the tiny graduation on traditional rulers, good for tailors, students, seniors. 324 Ft Long Measuring Tool - The digital tape measure ruler supports single range 0-29.5 feet distance measurement, cumulative distance measurement can be up to 324 feet. Light Weight and Pocket Size - 35g, Dia 2.09*0.6 inches. Ideal Surprise - This digital tape is a Ideal Surprise in any situation, fun and high-tech. educational, economical and pratical.