The Mini Monitor 900 Series of Geiger Counters and Ratemeters, manufactured in the UK by Mini Instruments Ltd (and latterly, Thermo Scientific) are amongst the most highly-respected radiation measurement and monitoring instruments in use today.

Over the years they have earned an excellent reputation for reliability, performance, versatility, ease of use and value for money. Mini Monitor 900s continue to be a popular choice in teaching, research, hospitals, industry and amongst environmentalists and enthusiasts. Here’s just a brief outline of the main features:
 
  • Large, logarithmic meter, accurately displays both very low and high levels
  • Portable & bench operation (mains adaptor or 6 x AA cells)
  • Battery life 300 hrs (typical, 4 hrs use per day)
  • Ease of use – single control for battery check, power on & mute

  • User-settable threshold alarm
  • Battery check
  • Built-in sounder with Mute function
  • Probe cradle and carry handle
  • External DC power & charge socket  
  • Rugged all-metal case
  • Curly probe lead
  • Available with a range of probes
  • Count & Dose rate (cpm/uSv/Hr) models in stock 

 

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The Mini Instrument 900s that we stock were all previously owned but they have generally been very well maintained regularly calibrated and are in good working order. In addition to any necessary case refurbishments we carry out a full range of operational checks, including probe supply testing & adjustment and, where applicable, pulse-calibration, which we repeat immediately prior to despatch. All models come with a 6-months guarantee.

 

Please note that these instruments may have been in use for several years so there might be some light scuff-marks and minor scratches, but unless stated otherwise they are full working order and, where applicable, have been pulse calibrated. Manuals will be included where available and other than a battery holder and window cover (where applicable) they are not supplied with any accessories. We grade the cosmetic condition of the instruments that we sell from A+ to D-, with A+ indicating ‘as-new’, and D- working but ‘tatty with noticeable scratches, dinks, dents etc. 

CURRENT STOCK (see photos, actual products, more available on request)

900/E/M3
£325.00 inc UK shipping 

Mini Monitor Type 900/E (MFG001)
Typical Applications: general detecting/monitoring, measurement/contamination control 
Meter Scale: 0 - 2k cps
Probe: type: E thin mica end window GM tube 6.0cm²
Energy Range: Manuf. specs
Sensitivities: Alpha, Beta, Gamma, X-Ray
Cosmetic Condition: B+

 

900/E/M1
£350.00 inc UK shipping 

Mini Monitor Type 900/E (MFG001)
Typical Applications: general detecting/monitoring, measurement/contamination control 
Meter Scale: 0 - 2k cps
Probe: type: E thin mica end window GM tube 6.0cm²
Energy Range: Manuf. specs
Sensitivities: Alpha, Beta, Gamma, X-Ray
Cosmetic Condition: A

900/E/M4 
£350.00 inc UK shipping

Thermo Scientific 900/E (MFG001)
Typical Applications: general detecting/monitoring, measurement, contamination control 
Meter Scale 0 - 2k cps
Probe: type E thin mica end window GM tube 6.0cm²
Energy Range: Manuf. specs
Sensitivities: Alpha, Beta, Gamma, X-Ray
Cosmetic Condition: A

900/R/M7 
£375.00 inc UK shipping 

Mini Monitor 900/R (MFG016)
Typical Applications: high-level dose-rate monitoring
Meter Scale: 0 – 5k uSv/hr
Probe type: Probe: Type MC10 Compensated GM tube
Energy Range: 45keV to 1.25MeV
Sensitivities: Gamma & X-Ray (. 75kVp
Cosmetic Condition: A

900/MC20/M5 
£400.00 inc UK shipping

Mini Monitor 900/MC20
Typical Applications: low-level dose-rate monitoring
Meter Scale: 0 – 75 uSv/hr
Probe: Type: MC20 Compensated GM tube, TNC connector
Energy Range: 50keV to 1.25MeV
Sensitivities: Gamma & X-Ray (>75kVp)
Cosmetic Condition: A-


900/72511/M8
£400.00 inc UK shipping

Mini Monitor 900/72511
Typical Applications: general detecting/monitoring
Meter Scale: 0 – 2000cpm
Probe: Type: LND 72511 thin-wall GM tube
Energy Range: (manuf. specs)
Sensitivities: Beta, Gamma
Cosmetic Condition: A

900/44A/M6 

£575.00 inc UK shipping

Mini Monitor 900/44A (MFG016)
Typical Applications: general detection, contamination control
Meter Scale 0 – 5k cps
Probe type 900/44A Nal scintillation probe, PET connector
Energy Range: 15 - 250keV (Beta > 500keV)
Sensitivities: Beta & Gamma
Cosmetic Condition: A-

900/42B/M2
£675.00 inc UK shipping

Thermo Scientific 900/42B (MFG015)
Typical Applications: very low gamma detection, contamination control
Meter Scale: 0 – 5k cps
Probe type: 900/42B Berylium window NAl scintillation probe, PET connector
Energy Range: 5keV - 250keV (Beta > 500keV)
Sensitivities: Beta & Gamma
Cosmetic Condition A+

 Very Important Stuff For Overseas Buyers:

The prices shown are for UK buyers and include insured courier shipping. Non-UK buyers: due to the weight variations of  these instruments, please email us at info@anythingradioactive.com  or click the Contact Us link at the bottom of the this page for up to date shipping costs. Please also note that this item may be prohibited or restricted in some countries.

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Mini Monitor 900s Geiger Counters & Ratemeters FROM: £325.00

  • Product Code: Mini Instruments 900
  • Availability: In Stock
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