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GemRed 360 Digital Protractor Angle Gauge FeatureWith absolute level sensor, no need to calibrate by your selfWith backlight, easy to readSetup of precise machinesDisplay always reads upright, no matter which way it is turnedLow battery indicatorTechnical dataItem No.: 82413-00BMeasuring range: 4*90 degreeAccuracy ±0.05° at 0°and 90°; ±0.15° at the rest angle. Resolution: 0.05°. Working temperature: 0 ℃~+50℃ IP Grade: IP65Magnets: V-groove magnetsBattery: 2*1.5V AAA alkaline battery(Included)Battery life: More than 100 hours in continuous using