The removable waterproof sensor holder incorporates a ceramic heater, which maintains the temperature of the bio-sensor chip during the test procedure. The product uses a two-part design with a disposable capillary-fill sampling chip that plugs into the main unit via the heated holder during testing. A small blood sample is placed on the sampling chip, which once inserted must maintain optimum contact with the bio-sensor at a temperature of 37∘C for testing.