An apparatus for using sensors having test strip with sheaths surrounding sensitive area configured to detect certain substance in a liquid test specimen includes a carrier having spaced-apart openings to frictionally hold the sensors, a loading portion to insert the sensors through the openings and to displace the sheaths thereby exposing predetermined lengths of the sensitive areas of the sensors, a testing portion including a container for containing a test specimen as only specified lengths of the predetermined lengths of the sensitive areas of the sensors are submerged in the test specimen, and an extracting portion structured and configured to receive the carrier with the plurality of said sensors inserted therethrough, the extracting portion having a comb-like structure for displacing the sheaths to return them to their stowed configurations and to eject the sensors from the carrier.
