?Large LCD Display High Precision? Preciva digital protractor is equipped with a large LCD display for easy reading; Measuring Range: 0~999.9; Accuracy 0.3; Resolution 0.1. ?Locking Function?Convenient locking screw-by pressing the screw, the ruler can be kept at any angle.For maintain its accuracy and read it easily, Preciva angle finder could be locked at any angle. ?2 in 1 Digital Protractor?Digital stainless steel ruler and angle finder combo makes precise measurements.the hinge mechanism on the angle rule allows complete 360-degree measurement of internal and reverse angles; The protractor combines standard and metric scale scales.Relative and absolute angle measurement. ?Durable Rulers Low Power Consumption?The digital protractor angle gauge angle finder durable stainless steel body can be used for a long time; HOLD and RESET function, laser engraving scale, clear and accurate, will not fall off.In addition, it also has the advantage of energy saving, it will automatically close after 6 minutes of inactivity. ?Battery Included?Large capacity standby with automatic power-off function ,use a CR2032 button battery to work for more than 2000 hours .Saving power consumption and extending battery life.