Description 1.Relative /absolute measurements interchcange at any position 2.Angle and slope readout conversion 3.Data hold 4.The display be turn off if you don't operate the device within ,the dispaly automatic turn off if you don't operate it within 3 minutes Compact and portable ,wide application Four side built-in powerful magnets Rechargeable battery Measuring range:4x90 Resolution:0.05 Accuracy: 0.2 Repeatability:0.1 Battery: Rechargeable battery, 3.7V lithium battery Work temperature:-10~50 4 sides magnetic Line Laser Accuracy: 3mm/1m (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: ABS Package Contents: 1 x Digital Protractor 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.