It looks just like a milwakie PH600. The one I have is yellow but I thought I saw some red ones when looking. You take off the cap and soak it in water over night and keep alittle water in the cap. Only submerge it to about half way so you can still read it. They are water resistant not water proof. You also need the 7.01 calibration solution because there is a small hole in the side where you ajust it with a small screw driver and then your set to go. Mines works very well and gives a quick nimber.