The first and last VFL in this picture are also marked as 30mW and are sold. But you can clearly see that they are much darker than the middle two. 3rd from left of this purchase. Unless it breaks very quickly I am very happy with my purchase and will be buying more.
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review