Detection Limit: 0.1ng/mg; Linear Range: 0.1-10ng/mg; Precision: within batch C.V. is ≤ 15%; between batches C.V. is ≤ 20%; Accuracy: the relative deviation of the measurement results shall not exceed ± 15% when the accuracy calibrator prepared by COC national standard or standardized accuracy calibrator are tested; Rapid test: within 5 min; Convenient: On-site hair sampling to avoid sample falsification; Long test window period: Not affected by drug metabolism in the body.  Store the detection buffer at 2～30℃. The sample diluents is stable up to 18 months. Store Aehealth KET rapid quantitative test cassette at 2～30℃, shelf lifeis up to 18 months. Test cassette should be used within 1 hour after opening the pack.