This is a Riken Keiki FI-21 Gas Indicator Monitor. Overall it is in very good to excellent condition with a few light scratches or scuffs. It is MISSING the ABSORBTION TUBE (You will need that part to make it work). The lens at the top of the unit is not glued in properly. There are two pieces of blue painter's tape holding the lens on. May need to be re-glued. A few tiny dabs of silicone may work. The unit has been powered up and functions. Requires 4 x C cell batteries. Not included. Made in Japan around 2006.

Actual items picture are for sale. 

my item group 36053