1. Made of high quality ABS material. 2. Voltage measurement range: DC 8-40V. 3. Temperature measurement range: -10~80 degree C. 4. Suitable voltage: DC 12-24V. 5. Voltage display: 3 digits, blue LED digital tube. 6. Temperature display: 2 digits, red LED digital tube. 7. Use for real-time monitoring car battery voltage, and detecting the car temperature.