This is a Bendix SRD charger for dosimeter Corporation 862 and other model pocket dosimeters.  These work with most self reading pocket dosimeters to charge them up for use.  They are great because they run on a single D cell battery.  We have other models if you have any additional needs.  We also have 120VAC models that work better than the battery ones (but the battery works on these when the power is out…).