RDS-31™ Multi-purpose survey meter


RDS-31™ Multi-purpose survey meter


The RDS-31 Multi-purpose Survey Meter is a small handheld, battery operated survey instrument using an energy compensated GM-tube as primary detector. Due to its versatile functions and durability it is suited for a wide range of applications in civil defense, industrial and laboratory use etc.

The RDS-31 meter features excellent ergonomics; lightweight and easy handling, with visual and audible alarms and internal vibrator. The large graphic display with Energy Save Backlight is well visible even in sunny conditions due to the illumination control.

To extend the capabilities of the instrument, an external GMP-25™ probe can be connected to RDS-31 meter directly through binder connector.


  • H*(10) ambient dose equivalent dose and dose rate
  • Wide range of external alpha, beta, gamma and neutron probes for direct connection with the RDS-31 meter
  • New ergonomic design
  • Large graphic screen, configurable backlight with automatic illumination control
  • High impact durable case construction, IP-67 immersion proof
  • Internal memory to store measurements
  • Flexible histogram functions
  • Firmware of instrument upgradable through cable link
  • Configurable shortcut functions
  • Complies with ANSI N42.33 and IEC 60846 standards


  • Dimensions: 3.93" x 2.63" x 1.29" (10 x 6.7 x 3.3 cm)
  • Weight:
    -.385 lb (.175 kg) without batteries
    -.485 lb (.22 kg) with batteries
  • Case: High impact durable plastics reinforced with glass fibre
  • Ergonomic Design: rubber grip and cushion around the case
  • Enclosure Class: IP67 (IEC 60529), waterproof including battery compartment
  • Power Supply: 2 AA size batteries (alkaline or NiMH)
  • Contacts: For external power and charging of NiMH battery (charging conditions +41°... +95° F) (+5... +35° C)


  • Radiation Detected: Gamma and X-rays, 48 keV...3 MeV. Alpha, beta and neutron radiation with external probes
  • Detectors: One energy-compensated GM tube, energy response according to ambient dose equivalent H*(10)
  • Dose Rate Measurement Range: 0.01 µSv/h...0.1 Sv/h or 1 µrem/h...10 rem/h
  • Dose Measurement Range: 0.01 µSv...10 Sv or 1 µrem...1000 rem
  • Resolution: Three significant digits or 0.01 µSv/h on dose rate and 0.01 µSv on dose (1 µrem/h on dose rate and 1 µrem on dose)
  • Calibration Accuracy: ± 5%, Cs-137, calibration direction and in the calibration field, temperature +20° C (68° F)
  • Dose Rate Linearity: ± 15% ± least significant number 0.05 µSv/h...0.1 Sv/h (5 µrem/h to 10 rem/h)
  • Variation of the Response Due to Photon Radiation Energy and Angle of Incidence: ( R E,A ) 71% < RE,A < 160% (48 keV...3 MeV); ± 60°
  • Two buttons to operate the instrument
  • Configurable Units: Sv(/h), R(/h), with external detector Gy(/h), cps, cpm, dpm, Bq and Bq/cm2
  • Flexible Histogram Functions: (dose rate, dose, diagnostic logging depending on configuration, time stamp, optional location control for mapping and repeating room measurement analysis)
  • Additional Histogram Analyzing Capabilities on CSW-31 Software
  • Real Time Clock Function
  • Configurable audible, visual and vibration alarm
  • RF-communication and USB-communication with Suitable Adapter
  • Graphic Display: 128x64 pixel with special symbols for alarm, external probe, battery, RF-communication, vibration alarm, chirp, and mute


078-435 Meter, Multi Radiation Survey, RDS-31S
Includes: Wrist/Neck Strap and Belt Clip.
  • Range: dose rate 0.01 µSv/h - 0.1 Sv/h
  • Dose: 0.01 µSv-10 Sv
  • Energy Range: from 48 keV to 3 MeV
078-436 Meter, Multi Radiation Survey, RDS-31R
Includes: Wrist/Neck Strap and Belt Clip.
  • Range: dose rate 1 µrem/h - 10 rem/h
  • Dose: 1 µrem-1000 rem
  • Energy Range: from 48 keV to 3 MeV
078-437 Meter, Multi Radiation Survey W/SW, RDS-31S
Includes: CSW-31 Pro Configuration Software, RDS-31S Meter, USB-Cable Link-31 for calibration and exploitation of all the features in the meter.


078-480 Probe, External, GMP-25
Includes: Fixed Spiral Cable 11.81" - 4.92' (30 cm - 1.5 m).
078-483 Software, CSW-31 Pro Configuration, RDS-31 PRO
Includes: USB-Cable Link-31
078-485 Source, Cs-137 Check for Survey Meters
1" x 0.25" (2.54 x .635 cm) and Manufactured of high-strength plastic Active diameter is 0.197" (.5 cm) with the active area centered in the disk.
078-484 Holder, Check Source for Survey Meters
1.8" x 1.8" x 0.5" (4.4 x 4.4 x 1.3 cm)

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