Easy to read indicator and designed for modern Propylene Glycol antifreeze. Number of floating discs indicates level of antifreeze protetion. Tests at hot and cold temperatures in Celsius and Fahrenheit. Floating orange disc shows over protection and loss of efficiency. A solution of more than 70% antifreeze will give LESS protection. Pure antifreeze will freeze at -6 F

• Easy to read indicator and designed for modern Propylene Glycol antifreeze.
• Tests at hot and cold temperatures.
• Reads in Celsius and Farenheit.
• Floating orange disc shows over protection and loss of efficiency.
• For the more popular Ethylene Glycol use Part No 4293.