Review on Professional Hand-Held Formaldehyde Detector - TOPINCN Portable by Steve Brethorst

This product is completely useless. Without instructions, his statement becomes meaningless. (It doesn't even have quantitative values so you know what the numbers mean. It should give you a false sense of security as it doesn't really tell you anything. On top of that it drains the batteries in about 20 minutes of use eh makes use expensive = useless item. Used it to test for "dangerous outgassing" from the ground and was informed by a reader that its readings are meaningless.