There is a discount at present. Please contact us if you are interested.In this series of measuring instruments,NF 273L (red light)/NF-274L(green light) can measure distance,length,height and spacing, and can also calculate the area and volume and Pythagorean measurement, and NF-273L/NF-274L upgrades these basic functions to operate automatic horizontal measurement, automatic vertical measurement, live voice broadcast, angle measurement. For more functions, please read thismanual carefully. This measuring instrument issuitable for indoor and outdoor measurements working.