Question 1

can you measure the frequency of the flickering with this?

Accepted Answer

https://m.media-amazon.com/images/I/61I6tYKNmOL._AC_SL1164_.jpg

To test the flicker rate of your monitor, simply push the "P" button on the unit and hold its sensor lens flat against your screen in one spot, without moving.
The flicker rate should be less than 5%. 
If it's higher, adjust your Brightness and Contrast settings. 
Meanwhile, if you press the "E" button to test your monitor's brightness, it should be between 300 to 500 lx. 
For flicker rates of LED and condescend light bulbs, the manual includes recommended rates or contact us at Tech Support.

Question 2

Where do I download the PC software?

Accepted Answer

From the company website here:
https://quartarad.com/wp-content/uploads/2016/12/radexlight_setup.zip

Question 3

can you measure the frequency (in Hz) of the flickering with this?

Accepted Answer

Flicker - aka Pulsation Rate of flickering (pulsation ration) indicates how much the illumination or brightness change in a given amount of time. 
It is measured as the difference between the median value vs highs and lows. Rr = (Emax-Emin)/2*Eav*100%. 
Unit of measurement is a percentage (%). Not Hz.

The only pulsations that should be controlled or adjusted are 300 Hz or lower. Depending on the work type, the light flickering should not strain the eyes if it does not exceed 10% for visually-focused tasks, and is not higher than 20% for all other tasks.
The office monitor should not flicker more than 5%.

There is Windows-based software for the device that deals with Hz and helps with converting percentages into Hz:
https://quartarad.com/wp-content/uploads/2022/02/Radex-Light-software.jpg

Question 4

The price shows (count 63.98/count) and 127.95. Does this mean two items included?

Accepted Answer

No it is 127.95 per unit, cannot understand what those count means but the performance of this item cannot be lower like 63.98. I already  bought 3.

ASIN	B01798BX0G
Brand Name	RADEX
Connectivity Technology	USB
Control Method	App
Controller Type	Push Button
EU Energy Efficiency Label	Energy Efficient
Incandescent Equivalent	100 Watts
Item Weight	1.3 Ounces
Light Color	warm white, white
Light Source Wattage	100 Watts
Light Type	LED
Manufacturer	RADEX
Model Number	LUPIN
Number of Items	1
Package Quantity	1
Power Source	Battery Powered
Special Features	Energy Efficient
Specification Met	CE
Type of Bulb	Fluorescent, Halogen, Incandescent, LED
Unit Count	1 Count
Voltage	240 Volts

RADEX LUPIN Professional testing and calibration of monitors, Incandescent light bulbs and LED. Light Meter, Pulse meter and Lucimeter

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