On Wednesday, February 21, 2018 at 8:21:42 AM UTC, Jeff Liebermann wrote:
On Tue, 20 Feb 2018 20:31:59 -0800 (PST), Andre Jute
wrote:

Sigh. I see that you haven't been reading my rants. That's the exact
model that I've recommended in at least three of my previous rants on
the topic. Also available on eBay and Amazon.
https://www.ebay.com/itm/222318701790
or search for "lux meter".

The more sources the better, then.

Andre Jute
I like your DIY calibration test, though.