A rich choice of external probes can be connected to FH 40 G with cable.

• Both values, from the external probe and the internal dose rate detector are simultaneously measured !For example:- neutron and gamma measurement- alpha/beta contamination and dose rate- remote and local gamma dose rate- local dose rate and 20 m under water
• Each probe is automatically identified by  FH 40 G and the correct parameters are set.        
• For both values separate alarms can be set        
• Cable length may be up to 50 meter

List of available external detectors for FH 40 G Survey Meter:

Gamma dose, dose rate detectors:

• FHZ 632 L - 100 nano Sv/h up to 100 milli Sv/h
• FHZ 612 - wide range, up to 10 Sv/h - fits to telescope 
• FHZ 312 - 20m under water probe, high range up to 100 Sv/h
• FHZ 302 - 20m under water probe, medium range up to 1 Sv/h

NaI Scintillation detectors:

• FHZ 512 - NaI 1"x1"   light weight, fits also to telescope of FH 40 TG
• FHZ 502 E - NaI 2"x2"   aluminium housing with holder
• FHZ 502 P - NaI 2"x2"   rugged plastic housing
• FHZ 503 E - NaI 3"x3"   similar to FHT 502 E , increased sensitivity

Plastic scintillation NBR detectors:

• FHZ 672 E - aluminium housing with "red - green information" for detection of artificial gamma radiation

Neutron detectors:

• FHT 752 - BF3 detector, neutron dose rate equivalent according to ICRP 60
• FHT 752 E - BF3 detector, handy and lightweight 
• FHT 752 S - BF3 detector, small size & lightweight, fits to telescope of FH 40 TG
• FHT 752 H - He3 detector, neutron dose rate equivalence according to ICRP 60
• FHT 752 EH - He3 detector, handy and lightweight
• FHT 752 SH - He3 detector, small size(BF3 detectors:  for excellent suppression of gamma radiation; He3 detectors:  for increased neutron sensitivity ) 

Contamination detectors:

• FHZ 732 - alpha+beta probe with 44mm diameter sealed proportional counter
• FHZ 742 - alpha, beta probe with an area of 125 cm^2, ZnS coated plastic scintillation detector