BG Fluid RX® (FRX) is a fluid condition sampling card used to test and diagnose the condition of vehicle fluids on-site. The card provides a quick, visual method for technicians to assess whether engine oil, transmission fluid, coolant or other fluids require changingsupporting faster, more confident service recommendations and reducing unnecessary fluid changes. A small sample of the fluid is applied to the card and the result compared against the reference scale to indicate fluid serviceability. The FRX card is supplied as a single card with the backing sheet removed for immediate use, as part of the BG Fluid RX® diagnostic system. For use with BG FRX Litmus Paper strips (SKU: FRX-LIT) to measure fluid condition parameters. For professional technician use as part of vehicle fluid maintenance assessment. Apply a small sample of the fluid to be tested onto the card and compare the result to the reference scale. Suitable for a wide range of automotive applications. Always follow t