Hercules® Cryo-Tek™ Test Strips simultaneously check the level of propylene glycol and level of corrosion protection. Behold the power of Hercules®, products built to last and trusted by plumbers to withstand even the toughest conditions.

• Contains 10 color-coded, disposable test strips
• Freeze protection levels and corrosion protection levels should be checked annually
• Add Cryo-Tek™ product if freeze protection is inadequate
• Add Cryo-Tek™ Universal Inhibitor if pH is below 85