GDS Technology hCG Control Solution, High Positive and Negative, 1 Box of 2 Coats and Jackets Hydrocollator M4 Heating Element 1500W MSHQ 1594XL Hydrocollator M4 Heating Element 1500W 120V Replacement Kit * Kit comes with Heating Element (2) Washers (2) Nuts & (2) Replacement Terminals if needed * Fits Model M4 Hydrocollator * Original Factory Replace Part * 1500W 120V You can be confident knowing that your transaction is being processed securely by one of the most trusted names in the payments industry There are two 5 mL dropper bottles in a box: One a hCG urine control positive The lids of these dropper bottles are color coded – the positive one is red and the negative one is green – so lab technician does not have to read label to ensure she is using the correct control