The Checkmate method is the Industries only valid field test for a quick and accurate determination of contaminant levels in Oil and Refrigerant.
The user connects the Checkmate body to a refrigerant source, inserts a detector tube and allows a small amount of gas to pass through. The detector tube is then removed and color change measures the contaminate level.

Each Kit is a foam lined plastic case containing:
(1) Brass detctor tube body.
(1) Blue extention hose.
(1) Pack of three (3) Acid Detector tubes.
(1) Pack of three (3) Moisture Dector tubes.
(1) Pack of three (3) Easy Oil Test Detector tubes
(1) 1/4 x 1/4 brass male union

Please request literature and instruction manual before ordering this product.