1Built-in high sensitivity sensor, fast measurement speed and high precision. 2With 3.7V lithium battery, the theoretical working time can reach 15 hours. 3The battery has short circuit, leakage, overload protection, and effectively protect the safety of the product. 4With a low battery reminder, no operation within 10 minutes can automatically shut down, do not worry about sudden power. 5Large LCD display, reading data is clearer and more convenient.