Lead Soil Check Kit_Starter this is the answer

this is the answer

4 ppm 5 Biguanide 486810 1

This calibration key is used to make sure your instrument functions the same at Day 1 from purchase as it will do on Day 100 and Day 1000 and so on

00 5 Chlorine

Lead Soil Check Kit_Starter this is the answerLead Soil Test strip measures 100, 200, 300, & 400 ppm (mg L) in less than 10 minutes. In addition, the strips are safe to use, packaged individually, non hazardous, and contain no potentially harmful components. Simply collect your soil sample, add the supplied reagent, and dip the test strip (5 tests included) for accurate results. Detects: 0, 100, 200, 300, 400 (tests for lead & other heavy metals)