On Call Plus Glucose Test strips are thin strips with a chemical reagent system. They work with the On Call Plus Blood Glucose Meter to measure the glucose concentration in whole blood. The blood is then automatically absorbed into the reaction cell. A transient electrical current is formed during the reaction which is detected by the meter. The blood glucose concentration is then calculated based on the electrical current and the result is then shown on the meter display.On call plus makes monitoring blood sugar very easy and affordable.As soon as the sample is provided the device transmits the results within 10 seconds.With its relative low cost.keeping check of your blood glucose level is simple.Sample can be taken from the forearm or finger tip.Only a very little amount of sample is required