Woot offers 3M Low Range Oil Quality Test Strips 1005, 4 Bottles of 40 Strips for $66.11 (orig. $118.06). Free shipping for Prime Members.

Product Description:
When a more precise reading of early degradation of oil is desired, try the 3M(TM) Low Range Oil Quality Test Strips. This strip measures free fatty acid concentrations at 1%, 1.5%, 2% and 2.5%. Ideal for food processing applications or to help meet regulatory requirements.

• This strip measures FFA (fatty acid) concentrations at 1, 1.5, 2 and 2.5 percent.
• 4 bottles/case, 40 strips/bottle
• For testing cooking oil in a commercial kitchen