Item Name: Digital Car Brake Oil Testing Tool Car Brake Oil Tester Engine Oil Tester. Moisture content less than 1% is normalWater content less than 3% should be notedSize: As the picture shownFunction: Back light, Led light, Sound and light alarm, Low battery alertTest oil type: DOT3,DOT4,DOT5.1If the water content is more than 3%, please replace the brake fluidOperating temperature: -10C-50CPacking included:1*brake fluid tester Note:1.Please allow 1-2cm error due to manual measurement.