Below are some video Tutorials to help you on your way...

PR650 Calibration Verify:

Shows how to verify the calibration of a Photoresearch PR650. This instrument was just returned to us after it was calibrated by Photoresearch. And, Luhr Jensen verifies the accuracy of the calibration against a known light source. This equipment is used to calibrate the Klein family of Colorimeters

Black Level Accuracy of the K-10:

This demonstration shows how the K-10 is one of the best stable Light measuring devices. This video was shot several months after the K-10 Colorimeter that was used in the video still has an amazing accuracy for low light. Low light accuracy is where light measuring devices have their most difficult time, and it's where home theater defines the difference between amateur and expert.

K-10 Range Calibration:

Colorimeter Speed: the K-10 with Large Photo diodes:

This demonstration shows the speed of the K-10 Colorimeter, even at low light, the K-10 is very fast, faster than other equipment at higher costs. Demonstrated by Luhr Jensen.  

HELLO World

K Colorimeter installer .rar here