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4-digits display, clear and easy for readings. Mini size, high performance and fast reaction speed. With good stability, high accuracy, anti-interference ability. Over-range display, the thousand unit display 1 or -1, the last three do not show. Using the latest A/D conversion chip, high stability reference IC and stick chip components. It can be applied to voltage and current measurement, also can be an external sensor to measure temperature, pressure, displacement and other physical quantities. Setting parameters will be memorized when power off. Suitable for detecting the speed of every kind of motors.