4 new luxmeters compared (sept 2018)

Today a really well wrapped package arrived. When i first saw the cardboard box i was not very happy but the right meter was inside.
Two eneloops are in the charger so i can test the meter.
Next step is to get a styrofoam ball to build a simple integrating sphere (Integrating sphere #4 (the fast and cheap one)).
I know a local shop is selling them but i will have to check the wall thickness. I want to use a 20 or 30cm sphere to be able to measure light up to 70-75mm.