Hello everyone
As a hobby project i made a device similiar to the famous SQM-L but based on the TSL2591 sensor capable to read up to 21.5 mpsas.
The body is 3D printed in black PLA and contain a 20° degree lens to offers directionality for the measurements.
Every device already include a rechargeable battery and comes calibrated in multiple points so values can be confronted with other darkness meter.
The device also includes a thermometer for thermal compensation.
It can be connected through a USB mini cable to communicate with a PC (tested with APT and SQM reader 3)
https://www.ebay.com/itm/386972258996
For size comparison with the SQM-L :
