ขาย เครื่องทดสอบแรงดันไฟฟ้า โวลต์มิเตอร์ดิจิทัล ขนาดเล็ก 0.28 นิ้ว 2.5V-40V หน้าจอ LED สีแดง น้ําเงิน เหลือง เขียว ราคาที่ดีที่สุด

The voltmeter is small, only 0.28 inches, range DC DC0-100V, 2 and 3-wire generic products, to break the routine voltmeter, is the latest design, can work directly on 5V, 9V, 12V, 24V and other circuits, without regulation. With three wiring, easy access to car / battery car / motorcycle car line, with reverse polarity protection function, line reversed not burn. Used to monitor battery voltage, grasp the battery voltage state, it can also be used for other products voltage measurement applications. Feature: 1. product stability, high measurement accuracy 2. Overall standard size, easy installation 3. Power supply protection circuit using a polar NOTE: Three-line voltage range 0-100V, but also for the use of second-line voltage is within 40V, otherwise there is a danger of burning. Technical Parameters: Operating voltage: 4.0 ~ 40V (with a reverse polarity protection function) Detection voltage: 0.0 ~ 100V Operating Current: <20mA Display: 0.28 "LED, red green blue yellow (colors) Dimensions: 30 × 11.7 × 9.2 mm (length*width*height) Installation hole: 23 × 10 mm Measurement rate: ≥200mS / times Accuracy: 3 ‰ Extreme working conditions Low operating voltage: + 4.0V Maximum working voltage: + 40V Working temperature: -10 ~ + 65 Humidity: 10 to 80% (non-condensing) Working pressure: 80 ~ 106kPa Sun exposure: no direct exposure