Colorimetric qualitative liquid

Example of a Colorimetric Qualitative Liquid Sensor strip-... 

Colorimetric qualitative detectors should not be used as the sole means for the detection of toxic vapors. However, these devices are suitable for use in low-risk settings where they can be worn on the exterior of PPE. Military M9 and M256 kits are examples of kits that wiU detect gases. The military M8 kit is an example of a kit that will detect chemical liquids. 

Lateral flow immunoassay (LFIA) is a special type of microfluidic test strip in which flow of liquid is governed by capillary forces. The chemicals required for detection are preimmobilized on the test strip and the detection is usually colorimetric, so that the results are visible using the naked eye. Because colorimetry provides qualitative results, electrochemical and other optical transductions have been used for quantitative detection of analytes. 

---