its to check the glosiness...
here is the info :
Gloss is a surface's attribute of directly reflecting light and the
degree of this reflected light is termed glossiness. The IG-320
discerns even the lowest levels of gloss and provides a definite
numerical value for glossiness. The IG-320 provides for appraisal
control based on objective data for such operations management
areas as floor maintenance, polishing, and coating. Because the
IG-320 does not require the use of special measuring technology, it
can easily be used by anyone. In addition, the IG-320's measurement
angle can be set from 20degreesto 60degrees, thus allowing for
measurement that accurately conforms to target surfaces.
Furthermore, operational efficiency has been further enhanced by
making the measuring device detachable from the main body.
Main Features
*The IG-320 features no-warm-up, one-touch test readings and
provides real-time numerical displays of glossiness using only the
sample measurement device.
*The IG-320 is equipped with ±5%F.S. measurement function.
* A lightweight, compact body makes the unit easily transportable
and easy to use on any production line.
* The IG-320's has an easy-to-insert battery and offers
continual-use time of more than 15 hours.
* The IG-320 is Japan Industrial Standard (JIS) compliant.
http://www.jp.horiba.com/analy_e/ig-320/index.htm
