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Penray TS100 Fill-For-Life Heavy Duty 2-Way Test Strips - Bottle of 50-Strips are designed for use in standard and conventional coolants. It effectively tests the SCA (nitrite) and freeze point of conventional coolants. It allows you to check the condition of your cooling system in less than two minutes. It is extremely precise. Determines freeze point and nitrite levels. The Penray brand of products is engineered for use by professional automotive maintenance and repair technicians. Our superior product line helps to improve gas mileage, extend engine life and improve overall performance with the consumer in mind. Technicians rely on Penray Professional Service Kits for fuel injection cleaning, power steering flush, transmission flush and other maintenance services. Penray’s broad line covers fuel additives, oil additives, maintenance products, service items and winter products. For over 65 years Penray has manufactured quality chemical products with innovative chemistry focused on automotive, heavy duty and marine applications. Each of our products is specifically engineered to help keep your vehicle performing at it’s very best.