I have 3 MSA Explosimeters...2 in working condition, 1 is for parts. I also have 1 hose so a person will need to buy the squeeze bulb to draw the gasses into the machine (old boat squeeze bulb may work) and the wand to attach to the hose, plus instal 6 C cell batteries. $150 ea. (working models) or $250 for everything that is in the picture. please check my other ads !!