Note: if another type of probe is desired, please let me know. This is an "ultimate combo" type package, although I would be happy to swap or add probes for a fraction of the retail price if desired. This counter is not an ebay long-shot, and is ready to use for regulatory compliance surveys and measurements. The circuitry has been examined using the quality control references which are provided by Bicron (now Thermo-Fisher), and passes the stringent battery of tests in a lab where the calibration instruments themselves are calibrated. The test equipment includes a variable output regulated power supply (which is set at 9.3 volts during the tests per technical manual calibration procedure, so there are no variances in current as there could be with batteries), multimeter, high impedance probes, and sources of known activity/meticulously calculated decay. All sources used to calibrate this meter are NIST traceable. It looks like new and functions like new, as it comes from a lab environment, was part of a seldom used emergency kit, and has been removed from that storage only for calibration and testing of the meter itself. The response kit was checked monthly and calibrated yearly. The entire kit was taken out of service because a different device (an ion chamber meter) in that same kit was past is recommended service life, even though it functions perfectly as well. Those particular kits are sold and serviced as one, so if any one instrument is misbehaving or the ion chamber goes beyond its five year manufacturer-recommended service life, all four instruments are replaced. Odd policy; yes, but it puts virtually unused pro grade equipment on the market at a third of the cost Last calibration and testing was done in August of 2014. It is currently certified for use within the University of California hospital and lab facilities, which have calibration standards that far exceed the NRC regulations for power plants and nuclear materials facilities. This Geiger counter/rate meter really doesn't belong on ebay, but it's never bad to have actual professional-grade equipment rather than surplus or discount refurbished stuff in a market where a purchase is usually a risk. Please feel free to ask any questions. Make sure you're getting exactly what you want and what you're paying for before you buy it. More info about the meter: The meter comes with two probes, both are energy compensated and designed to work with the 0-2.4 million CPM/0-2,000mR/hour scale. This means either of the probes will provide actual hard x-ray/gamma dose rate in Roentgens/hour and CPM, or milliREM/hour in gamma-only fields. The first of the two probes is internal, which makes the meter usable for high range dosimetry (0-2,000mR/hour, that's 2 R/hour) even without an external probe. The probe holder can be easily removed in seconds for use as a compact real time dosimeter. It is much more precise than an ion chamber for dose ranges of below 2R/hour, and no other professional-grade counter with an internal probe has the circuitry to ensure such accuracy. Automatic dead time compensation adjustment and various other automatic adjustments are just the front-end features of this meter. It measures both dose up to 2,000mR/hour and CPM up to 2.4 million counts per minute, which is 80 times higher than meters like the CDV 700, while it just as easily reads even background radiation on it's lowest setting (0-240 counts per minute) It has five different selectable ranges, from 0.1x-1,000x, which is really nice! Even with the internal probe, this meter has such a high count/dose range that it can be used in place of an ion chamber for low-moderate fields of gamma radiation, as geiger counters are much more accurate on lower scales where ion chambers are much more accurate on high dose rates. Additionally, the external probe is of a really unique design which I have never seen before (if you can identify it, please let me know). It is the only external probe needed for simple surveys and eliminates the need to carry several other probes, including a relatively large pancake probe. I would like more of these probes, but can't find any that are quite the same. While the probe is it is scaled for dosimetry specific to the instrument, the tube is about twice the size of the LND-725 and has a much thicker housing with an alloy that sculpts the detectable energy range. It is so large because it is compensated for optimal gamma detection at 400-1200kEV; but like any other probe, picks up much higher and much lower energies. It has a thin window which is uncompensated, and equally sensitive to a pancake probe in regard to detection of alpha and beta. The energy response is different than the EWGM probe normally paired with these; and it's really compact but long enough to detect alpha and beta without having to remove the probe from the clip or contorting the meter with your wrist like the much shorter and fatter EWGM probe. If you'd rather have a Bicron EWGM or HP-270 probe, please contact me and we can arrange for that. This would be the ultimate hobbyist counter, but it is designed and ready for industrial health physics use.. The internal probe used on the x1000 setting has a lower detection energy range, which is optimized for 40keV-1.2MeV. There is a beta window on the internal probe even though Bicron doesn't mention it as a feature. It has to be popped out of its case to detect beta using the internal probe, which is probably why it isn't listed as a feature. Still pretty handy, I say. Passed extensive factory-defined scope tests for new meters, and is calibrated. (Date 8/2014, due August 2015). Manual is included on digital media with the meter. Although it is quite adequate as is, extensive user modifications are possible with this meter. This includes anything from simple replacement of the bulkhead jack with a BNC connector, to a relatively easy procedure which allows it to be use with all scintillation probes. (I have done both, and have a scintillator/GM switch on the front which enables and disables the anti-saturation unit so scintillator probes can be used. Other relatively simple mods allow both the internal and external probes on all ranges, which is a bit more complex but is safer to do than some other mods. My favorite: the single channel analyzer mod. For just a few dollars worth of parts and learning how to read and implement minor changes in schematics, this can be turned in to an ultimate single channel analyzer. It's the same circuit as the Bicron Analyst. All it needs (seriously, this is awesome) are a couple of pots or variable resistors and a few solder joints. Practicing soldering skills is recommended prior to doing these things... I love how Bicron anticipated these modifications, and they actually show you exactly where to drill the holes to add switches. Men far more innovative than myself have posted an extensive modification tutorial, easily found through google. I can't say enough great things about this meter. Clearly, you are responsible for the meter once it is yours, so consider what you want to do carefully. Any questions are welcomed and encouraged. This is a big decision; as less expensive but more risky meters are quite tempting and may actually be a better option for you. I am know this particular meter in and out, but if I can't answer a question, I will refer you to somebody who can. Enjoy!
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