Features; 1. Fast heating speed. Temperature heats accurate. Temperature controls precise. It works stable without noise. 2. Built-in temperature deviation calibration function, automatic fault detection, and beep alarm function. 3. Built-in over-temperature protection device, safe and reliable. 4. Compact structure designed with transparent cover, small space occupied. 5. Serious of round heating blocks for choosing. Easy exchange and clean for different types of tubes.