M43 Chemical agent detector

I've had this for awhile now and have always wanted to see what it's worth and possibly sell it. I've seen some online got for about $1,000 but they were old demilitarized units. This as far as I can tell is old stock or barely used. It still has the original foam case and an unopened canister with it. Basically I'm seeing if anyone on here knows what something like this is worth?

What you have is the early, non-radioactive detector. M43A1 detectors used americium to detect agents, the M43 was enzyme based. As far as worth, I don't know. Does it have the remote alarm?

No just have what is pictured. I've done some digging around on the internet and found a few variations/ generations. It might of been an older model that was $1,000. I know they have remote alarms and a large battery pack that can go with it.