Features: All use the superb SMT process, and the consistency is good. The crystal of the head is made of high quality quartz crystal with high precision and high stability. LED digital tube display part, all on the line plus finite current resistor, more secure. The power supply part adopts the reverse connection protect function, and the power supply positive and negative reverse connection will not burn. This product can also be used to test positive and negative current values. The current meter head of DC0-10A does not require an external shunt and can be directly tested. The product has good stability, high measurement accuracy and strong anti-interference ability. The exterior is standard in size and easy to install. Specifications: Condition: 100% Brand New Material: Plastic Full scale: +/-5.000/10.000A Resolution: 0.001A Working voltage: +5V±0.5 Working current: <100mA Display mode: Full seal, LED height 0.56" (Red, blue optional) Decimal point position selectable Can be calibrated by potentiometer SMT process Input impedance: >1MΩ Measurement rate: ≥ 2 / S Overrange display: "H" Working voltage: +5V±0.5 Working temperature: -10 ~ +50℃ Working humidity: 10~80% (no condensation) Working pressure: 80 ~ 106kPa Sunlight: no direct illumination Size: approx. 79*43*26mm / 3.1*1.7*1in Mounting opening: approx. 76*39.5mm / 3*1.6in The difference between the new full-sealed head and the old full-sealed head: 1. The new and old full enclosures are installed in the same size. 2. The circuit principle of the new and old full-season sub-products is the same, and the accuracy is the same. 3. The head of the new full-encapsulation: the front is a pure plane, the characters displayed are very clear; the head of the old full-enclosed: the front is a circular surface, the displayed characters are blurred, not clear enough. 4. The head of the new full-sealing: The large digital tube of 0.56-inch is used to display characters large enough. When the head of the YB5135 three-and-a-half-and-half is mounted on the same panel, there will be no display characters. Phenomenon; old full-sealed head: 0.4-inch digital tube. Package list: 1 * Ampere Meter 1、All use the superb SMT process, and the consistency is good 2、The crystal of the head is made of high quality quartz crystal with high precision and high stability 3、LED digital tube display part, all on the line plus finite current resistor, more secure 4、The power supply part adopts the reverse connection protect function, and the power supply positive and negative reverse connection will not burn 5、This product can also be used to test positive and negative current values