OFCEAS laser analyzer
impurity in hydrogen LoD example
H2O 0.02ppm; CH4 0.001ppm; O2 0.1ppm; CO2 0.01ppm; CO 0.001ppm; H2S 0.001ppm; HCHO 0.001ppm; HCOOH 0.01ppm; NH3 0.001 ppm; HCL 0.00005ppm; COS 0.001ppm

Dust Decoder - portable aerosol spectrometer
pm10, pm2.5 and pm1,TSP, PM10, PM4, PM2.5, PM1, PMCoarse and Total Counts
0 - 5 300 000 particles/l