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CD V-710 Survey Meter
The CD V-710 is one of the early issue Civil Defense instruments. The only documented date I have seen in relation to this instrument is 1955 from a Jordan Model 2 manual that has a copyright date of 1955 on the back cover. The CD V-710 was superseded by the CD V-715 when it was issued later in 1962. The entire family of CD V-710s went through disposition in the 1960s. Most of the CD V-710s found today have had the labels defaced and the "CD" logos marked over. This was done during the disposition process. (See Below) The CD V-710 was manufactured in both metal and plastic cases. The early CD V-700 had one model with a plastic case as did the CD V-720.
The CD V-710 is a radiological survey meter that reads only Gamma radiation. The range of the CD V-710 is 0-50 Roentgens per hour. The scale of the meter reads in 0-0.5, 0-5 and 0-50 R/hr using an Ion Chamber detector. All of the 710s use various combinations of D-Cell and 22.5 Volt batteries. The CD V-710 Model 1 might be the most hard to find of all the CD meters. I have only ever personally seen the one (pictured below) that I have in my collection.
Better View Of The Very Uncommon CD V-710 Model 1/El-Tronics Model Number SID-1
This is the CD V-710 Model 1 or El-Tronics SID-1. Notice the manufacturers model number SID-1 is printed on the side of the case. The CD V-700 Model 1 and Model 2 also have the manufacturers model numbers as part of their identifications but the later CD instruments are all identified by the CD V numbers alone.This unit is similar in build to the CD V-710 Model 2 by Jordan. I've seen some photos of other types of El-Tronics Geiger counters and they all appear to have the same type of huge cast iron handle that this meter has. The huge handle makes the zero knob virtually inaccessible. The 710 Model 1 and Model 2 both have all metal cases where the 710 Models 3-5 all have plastic cases. This El-Tronics unit takes no less than 5-22.5 volt batteries and 1 D-cell to power it. This unit did have a CD emblem on the case but it was scratched off and the paint touched up with spray paint.New Condition CD V-710 Model 5, Victoreen
In March of 2006 I got a partial CD V-777 kit consisting of a this CD V-710 and a CD V-720. This is one of the nicest items in my collection. It even still has the original batteries and the strap with it. A very nice example of the set of items that came with CD V-710s when they were new.
Disposition Process Of Obsolete Civil Defense Instruments.
Here is a good example of a CD V-710 Model 4 that has gone through the disposition process. The old CD V-710s are commonly found in this condition. The CD emblem and identification label have both been painted over on this meter. I have seen some of the plastic case CD V-710s that have had the ID labels burned though with a soldering iron but it seems like most were painted like this. To see the document describing the disposition process click here. The document is in Adobe Acrobat pdf format.