Comparator

Black plastic phosphate comparator. Coloured glass slides are visible on one side. There are three labels on the side with the vials. They read first, "LIQUID COLOR STAND___ PROTECT FROM FREE___," "LOW PHOS___ 0-25," and "THIS TESTER IS WARRENTED TO GIVE ACCURATE RESULTS ONLY WHEN REAGENTS AND PARTS PRODUCED BY THE MANUFACTURER ARE USED." There are also the numbers 0, 2, 4, 6, 8, 10, 15, and 20 on the side.