PRO-LAB Carbon Monoxide Test Kit;

Professional carbon monoxide test kit & detector, detects invisible & odorless Gas, stick on carbon monoxide detector safe & easy to use, more sensitive than electronic detectors & provides accurate & reliable results, replace sensor button every 6 x months, un-opened sensor buttons shelf life is 3 years, great for use in boats, airplanes, RV's & automobiles, includes: detector & 2 reusable sensor buttons, laboratory tested for accuracy.