HIGH PRECISION:
✔ 1. Built-in AD584kh, highest accuracy and stability.
✔ 2. The MCU switch 4-channel reference voltage output with LED indicators.
✔ 3. Single-button operation switch reference voltage.
✔ 4. Easy to carry, can be charge by DC 5V, with charge indicator.
✔ 5. Transparent case can protect module from damage and provide clear view.