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The tachometer measures the RPM of automobile engine and displays the numbers on LCD with high accuracy, thereby assuring our safety.Features: Digital display with black face and blue LED. Used to measure the RPM of automobile engine. Measurement range is 0~9999RPM. Red warning light. High accuracy and easy operation. Specifications: Color: Black LCD size: 52mm / 2in Unit: RPM Measurement range: 0~9999RPM Warning point: 5000RPM Power: 12V DC, Max. 0.3A Tachometer size: 5.7 * 5.5cm / 2.2 * 2.2in (diameter * height) Tachometer weight: 72g / 2.5oz Package size: 17 * 12 * 7.8cm / 6.7 * 4.7 * 3.1in Package weight: 205g / 7.3oz Package including: 1 * Tachometer