UK Shipping included; overseas buyers see important note below*


Mini Monitor 900 Series Geiger Counters and Ratemeters, manufactured in the UK by Mini Instruments Ltd (and latterly, Thermo Electron/Scientific) are amongst the most highly-respected radiation  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 continues to be a popular choice in teaching, research, hospitals, industry and amongst environmentalists and enthusiasts. Here’s just a brief outline of the key features:
 

  • Fully Tested and Calibrated prior to dispatch
  • 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 (charger and batteries not supplied)  
  • Rugged all-metal case
  • Curly probe lead
  • Available with a range of probes
  • Count & Dose rate (cpm/uSv/hr) models in stock 
  • Instruction Manual (see note below) and Calibration Certificate Included
  • NEW Optional Waterproof Instrument Carry Case £39.99 (see below) 


                                            First time buyer?  Please Click HERE



NEW! PROTECT YOUR INSTRUMENT

Optional hard waterproof carry case now available for most models *. Protect your instrument from knocks, bumps, water and accidents with a high quality IP67-rated, impact resistant carry case. Features include soft grip handle, holes for padlocks, auto pressure release, stackable design.  Price, including delivery with instrument now  £34.99. To add a case to your order simply click the item on the drop-down options list. More Coming......

*unsuitable for the 900/BPGM due to the size of the probe. Larger cases available on request.


 Important Small(ish) Print. Please Read. It's At The Bottom... 


A SELECTION OF OUR CURRENT STOCK

They're Changing All The Time So Please Ask If The Model That You Require Isn't shown

(actual product photos, more pics available on request)

And by the way, we also buy, repair and calibrate Mini Monitor 900s at very favourable rates


900G/MC70
£300.00 inc UK shipping

Typical Applications: low-level dose-rate monitoring
Probe: Type: MC70 Compensated GM tube, PET connector
Energy Range: 50keV to 1.25MeV
Sensitivities: Gamma & X-Ray (>75kVp)
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A-
Meter Scale: 0 – 75 uSv/hr


900/AR ZP1/2 
£375.00 inc UK shipping

Mini Monitor 900/ZP (ARZP1451)
Typical Applications: monitoring, general detecting
Probe type: Probe: Custom ZP1A 28mm mica end window Compensated GM tube TNC Connectors
Sensitivities: Alpha, Beta, Gamma
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A-



900/72511
£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
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A


900/E-5
£380.00 inc UK shipping

Mini Instruments 900/E-5
Typical Applications: general detecting/monitoring, measurement, contamination control 
Meter Scale 0 - 500 cps
Probe type: anodised aluminium E probe, 6.0cm² thin mica end window GM tube
Cosmetic Condition: B+
User-Set Threshold Alarm:  Yes
Sensitivities: Alpha, Beta, Gamma, X-Ray




900/E (A)
£400.00 inc UK shipping

Mini Instruments 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 
Sensitivities: Alpha, Beta, Gamma, X-Ray
Cosmetic Condition: B+
User-Set Threshold Alarm:  Yes
Energy Range: Manuf. specs





900/E (B)
£400.00 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 TNC connector
Sensitivities: Alpha, Beta, Gamma, X-Ray
Cosmetic Condition: B+
User-Set Threshold Alarm:  Yes
Energy Range: Manuf. specs



900/E (C)
£400.00 inc UK shipping

Mini Instruments 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 
Sensitivities: Alpha, Beta, Gamma, X-Ray
Cosmetic Condition: B+
User-Set Threshold Alarm:  Yes
Energy Range: Manuf. specs





900/AR1288 -- Low Cost Scintillator,

OUT OF STOCK

Mini Monitor 900/AR1288
Typical Applications: Gamma detection/contamination control
Meter Scale: 0 – 5kcpm
Probe: Type: AR1288 Gamma Scintillation 30mm Nal (TI), Hamamatsu PMT 
Sensitivities: Gamma & X-Ray
User-Set Threshold Alarm:Yes


Cosmetic Condition: A+



900/EP15 (2)
£580.00 inc UK shipping

Mini Monitor 900/EP15                                                                                                                          
Typical Applications: high sensitivity Alpha, Beta, general detecting/contamination control
Meter Scale: 0 – 500cpm
Probe: Type: LND 7313, large window  halogen quenched GM tube
Energy Range: (manuf. specs)
Sensitivities: High Sensitivity Alpha, Beta & Gamma
User-Set Threshold Alarm:   Yes
Cosmetic Condition: B++



900/EL
£550.00 inc UK shipping

Mini Monitor 900/EL                                                                                               
Typical Applications: high sensitivity Alpha, Beta, general detecting/contamination control
Meter Scale: 0 – 500cpm
Probe: Type: DN212 5cm mylar/Mica end window  organic quenched GM tube
Energy Range: 
Sensitivities: High Sensitivity Beta +  Alpha & Gamma
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A



900/BPGM
£600.00 inc UK shipping

Mini Monitor 900/BPGM
Typical Applications: monitoring, general detecting
Probe type: Probe: Bicron PGM mica-window 'frisker' Pancake Probe,  MHV connector
Sensitivities: Alpha, Beta, Gamma
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A




900/AR1705 NEW!
£650.00 inc UK shipping

Typical Applications: Gamma detection/contamination control
Meter Scale: 0 – 5kcpm
Probe: Type: AR1705 Gamma Scintillation 35mm Nal (Ti), Hamamatsu PMT 
Sensitivities: Gamma & X-Ray
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A+
Mini Monitor 900/AR1705                                                                                                                          




900/CSP
£680.00 inc UK shipping

Mini Monitor 900/CSP
Probe type: Custom Nal scintillation probe, TNC connector
Typical Applications: very low gamma detection,
contamination control
Meter Scale: 0 - 5k cps
Sensitivities: Beta, Gamma & X-Ray
User-Set Threshold Alarm: Yes
Cosmetic Condition: A 




900/42A
Out of Stock, More Soon

Mini Instrument  900/42A (MFG014)
Typical Applications: Low intensity X-Ray, low gamma detection, contamination control
Meter Scale: 0 – 5k cps
Probe type: 900/42A NAl scintillation probe, PET connector
Energy Range: 5keV - 250keV (Beta > 500keV)
Sensitivities: Beta & Gamma
User-Set Threshold Alarm:   Yes
Cosmetic Condition A+

* includes FREE waterproof hard carry case 



900/42B
OUT OF STOCK

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 & X-Ray
User-Set Threshold Alarm:   Yes
Cosmetic Condition A+

* includes FREE waterproof hard carry case 



900/S42
OUT OF STOCK

Mini Instruments 900/S-42 
Typical Applications: gamma, X-Ray contamination control
Meter Scale: 0 – 5k cps
Probe type: 900/S-42 NAl scintillation probe, PET connector
Energy Range: 5keV - 250keV 
Sensitivities:  Gamma & X-Ray
User-Set Threshold Alarm:   Yes
Cosmetic Condition A

* includes FREE waterproof hard carry case & zipped probe case



900/44A-P** £680.00 inc UK Shipping

Probe type 900/44A Bicron BC412 plastic scintillator, PET connector (notethe Nal crystal in this probe has been replaced -- see below
Typical Applications: very low gamma detection, contamination control
Meter Scale: 0 – 5k cps
Energy Range: 100keV - 5MeV
Sensitivities: Gamma, fast neutrons, charged particles, cosmic rays, muons, protons
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A-

* includes FREE waterproof hard carry case 

** Important Note: refurbished probe with 34 x 15mm Bicron BC412 crystal. Similar sensitivities to standard Nal (T) crystal, (using standard Cs137 check source) compared with standard 44A probe 


NEW 900/44A £780.00 inc. UK Shipping

Mini Instruments MFG 016
Probe type 900/44A Nal (T) PET connector  
Typical Applications: very low gamma detection, contamination control
Meter Scale: 0 – 5k cps
Energy Range: 500keV - 5MeV
Sensitivities: Beta, Gamma, X-Ray
User-Set Threshold Alarm:   Yes
Cosmetic Condition: A+
* includes FREE waterproof hard carry case 


 The All-Important Small Print

The Mini Instruments & Thermo Electron/Scientific/Morgan) 900s that we stock were all previously owned but they have generally been very well maintained, regularly calibrated and are in full working order. In addition to any necessary case refurbishments and deep cleaning we carry out a full range of operational checks, including probe supply testing & adjustment, circuit board & cable inspection and pulse-calibration (according to MI protocols and data). This is repeated immediately prior to dispatch.  Some models have fixed probe/ratemeter cables, others have the factory original PET or TNC type connectors. If you have a specific connector requirement we may be able to help, just ask. All models come with an unconditional  6-months guarantee.

Whenever possible we include a copy of the original user manual; we try to ensure that they are  model-specific but in some cases they may be a generic version, covering operation and maintenance.  We also include a battery holder and in most cases, a vented end-window protective cover. Unless noted otherwise they do not come with any other accessories. Instruments are graded according to cosmetic condition from A+ to C-, with A indicating 'as-new' to very good, and C, full working order but somewhat tatty or with more noticeable scratches, dinks and dents, etc. 

And finally... Whilst the instruments that we sell are all in full working order, calibrated, and guaranteed, we do not certify or endorse them for regulatory, health and safety or safety-critical and related applications. 


PLUS, Vital Information For Overseas Buyers:

Hallo, Bonjour, Guten Tag, Nín hao, Namasté, Ahlan bik, Geia!, Shalóm, Hai, Kónnichi wa, Annyeonghaseyo, Szia, Salâm, Witajcie, Privét, Hola, Adaab arz hai, with apologies to anyone we’ve missed…

The prices shown are for UK buyers and inclusive of delivery to mainland UK addresses. Overseas buyers are welcome and should contact us before ordering for shipping options, which vary according to location. Please also note that this item may be prohibited or restricted in some countries.


Write a review

Please login or register to review

Mini Monitor 900s Geiger Counters, Rate & Dosemeters - NEW STOCKS

  • Product Code: Mini Instruments 900
  • Availability: 2-3 Days
  • £0.00


Available Options