<p>Based on this <a href="http://www.ev3dev.org/docs/sensors/lego-ev3-infrared-sensor/" rel="nofollow">API reference</a> and <a href="http://forums.usfirst.org/showthread.php?21194-EV3-color-sensor" rel="nofollow">this discussion of the color sensor</a> it looks like "pct" is short for <strong>percent</strong> as in a ratio with 100.</p>

<p>David added in a comment:</p>

<blockquote>
  <p>EV3 hardware developer kit provides a bit more info on what 100% means: </p>
  
  <blockquote>
    <p>The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection.</p>
  </blockquote>
</blockquote>

CC BY-SA 3.0
2016-03-07T17:45:01.323Z
The EV3 hardware developer kit provides a bit more info on what 100% means: "The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection."
David Lechner
CC BY-SA 3.0
2016-03-06T22:03:19.293Z
2016-03-07T19:04:54.830Z
2016-03-07T19:04:54.830Z
chicks
<p>My son is using his EV3 with a color sensor. He is using the sensor to test the reflectivity of different materials. Can you please tell me what the letters "PCT" stand for?</p>

<ev3><sensor-colour>
LEGO Color Sensor - EV3
Stefano
# LEGO Color Sensor - EV3

(Asked by: username_0 on 2016-03-06)

My son is using his EV3 with a color sensor. He is using the sensor to test the reflectivity of different materials. Can you please tell me what the letters "PCT" stand for?

**Tags:** ev3, sensor-colour


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## 1 answers

### Answer by username_1 on 2016-03-06. Score: 4

Based on this [API reference](http://www.ev3dev.org/docs/sensors/lego-ev3-infrared-sensor/) and [this discussion of the color sensor](http://forums.usfirst.org/showthread.php?21194-EV3-color-sensor) it looks like "pct" is short for **percent** as in a ratio with 100.

David added in a comment:

> EV3 hardware developer kit provides a bit more info on what 100% means:
>
> > The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection.

> **Comments:**
> **username_2**: The EV3 hardware developer kit provides a bit more info on what 100% means: "The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection."  

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