[Highly Sensitive 2-In-1 Contact & Non-Contact Measurement] Digital tachometer specializes in measuring rotational speed,linear speed and flicker frequency.It combines both non-contact and contact measurement modes for more flexible use.Non-contact mode uses photoelectric technology to detect some fast and unmeasurable objects,and the contact mode measures by tachometer directly touching the measured object,which is an excellent choice for dirty and dusty environments. [Accurate Non Contact Digital Tachometer] This digital tachometer rpm meter is non contact. With high-speed laser and instant readings from 9.0 to 99,999 rpm, this non contact digital tachometer can give you accurate rotational speed readings from a distance. [Data Storage/Hold Function & Low Battery Reminder] Tachometer has data memory function,which can automatically save the maximum value/minimum value/last value,and the instrument automatically saves the last value when the tachometer shuts down unexpectedly.In addition,it will automatically shut down if there is no operation for about 15 seconds,saving energy and power. [Equipped With Replaceable Contact Probe & Wide Range Of Application] Digital tachometer RPM meter probe is detachable and equipped with four highly sensitive contact probes,which is suitable for measurement in different scenarios.Comes with a portable handbag,the tachometer can be put into the bag after each use,easy to carry and prevent loss and damage.Tachometers are widely used and are often used in manufacturing fields such as motors,fans,washing machines,automobiles,airplanes,and ships. [Multiple Function] The non contact digital tachometer with the backlit LCD to allow making and reading measurements in low light conditions; automatically store max value, min value and the last measurement value; data lock; 15 seconds no operation automatic utdown and so on. Colour:Black & Orange Material:Plastic Package Contents: 1 * Digital Multimeter 4 * contact probe 1 * English instruction manual 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.