Do Test Kits Strips Work? Yes, they do. All of the test kits that we order are rigorously tested to ensure that they work as per their intended purpose of use. Each order has a sample run produced, tested to ensure that each parameter meets our strict standards. Once approved a final run is produced and tested again to ensure that the final results are the same as the first. Below is the final test from our most recent batch dated 21st December 2020. Once this batch is sold and a new lot is produced and we upload to this page the most recent test results.