Product Features Improved ultrasonic launch angle design anti interference technics utilization Ultrasonic diameter is well known as electronic ruler which is suitable for architecture decoration construction measurement Comparing to a traditional flexible ruler the ultrasonic diameter can access a further area which traditional one is not capable Brand new high quality LCD with backlight Your distance measurer transmits ultrasonic waves to a point you want to measure It measures the time taken by the waves to reflect and then calculates and re transcribes the distance Switch off if you do not press any key for about 1 min Units of measure by feet meters Working temperature 32 F to 109 4 F 0 C to 43 C Resolution 0 01M or 1 2 inch Measure distance from 1 5 feet to 60 feet about 0 5 to 18 meters Power supply 1 x 9v alkaline battery battery not included Lightweight and portable design it is easy for you to operate it Area volume addition subtraction calculation Specifications Maximum Accumulative Measure Distance 180 00M Maximum Measure Square 18M x 18M Maximum Measure Cube 1800 00Stere Measure Error 0 001 Precision 0 5 Resolution 0 01M or 1 2 Inch Operate Temperature 0 50 Power Supporting 1 x 9V Alkaline Battery Not included Frequency 40KHz Dimensions 5 91 x 2 76 x 1 18 15 x 7 x 3 cm L x W x H