1.Hold the maximum value,minimum value average value and thelast measured value 2.Fully display operation instruction and unit symbol,whichis concise and explicit. 3.Wide measuring range and high resolution. 4.Battery low power indication,LCD backlight display,and auto shutdown. 5.Adopt thelatest microprocessor technology and laser technology, which enables the instrument to be more intelligent and reliable.Oversized screen LCD display, with clear indication. Solid and delicated structure. The entire machine adopts durable and optimized electronic elements,and the shell adopts light and solid ABS lastic,with beautifulappearance and convenientuse. Warning: In order to avoid potential harm to users. please comply with the following instructions:Laser product:please do not watch directly which may cause blindness. Do not let children play with it. Precautions: In order to measuring precision, please pay attention to the following points The best measuring distance between instrumentand measured object is 50-500mm,and the best angle for instrument at measured object is within 30 degrees,which can effectively multiple reflections on surface of the measured object. lfthere is no reflection tag, it is necessary to make sure thatreflection point on measured object has sufficient reflection.Under this circumstance, the instrument has to be vertically aligned to the measured object to inspect whether the instrument can read. Non-reflection area has to belarger than reflection area. Before posting reflection tag, the spindle surface has to be clean and smooth. lfthe instrumenthas not been used for a long time, please take out the battery to avoid being damaged due to battery decomposition. Does not include 3 1.5V AAA batteries Colour:black+orange Material:ABS Package Contents: 1 x Tachometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.