Ludlum 5

Handheld survey meter

Ludlum 5 – handheld survey meter from Ludlum Measurements. Weight as specified: 1.6 kg, including batteries.

Detector: Two energy-compensated GM detectors, housed inside the instrument enclosure1
Weight as specified: 1.6 kg, including batteries1

Download product sheet (PDF)All values with references – for tender documents

Specifications checked against the manufacturer’s documents on 2026-10-16

Manufacturer’s product page (opens in a new tab)

Overview

Nuclear power & nuclear technology Defence, security & preparedness Emergency services & first response Environmental monitoring & radiation protection Industry & quality control

Specifications

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

Detector

Detector	Two energy-compensated GM detectors, housed inside the instrument enclosure1

Measuring range

Measurement range	0 to 20 mSv/h (0 to 2000 mR/hr)1
Energy response	Within 15% of true value from 60 keV to 3 MeV1

Electronics & signal

Detector bias	540 ± 25 Vdc1

Power & battery

Power supply	Two "D" batteries1
Battery life and conditions	Typically greater than 2000 hours1

Mechanical

Dimensions (H × W × L)	19.0 x 8.9 x 21.6 cm1
Weight as specified	1.6 kg, including batteries1

Environment & ratings

Operating temperature	-20 to 50 °C1

The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.

Documents

PDFDatablad (PDF)Datasheet · Ludlum

Sources

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

1
Model 5 – Geiger Counter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector'; Specifications tab, 'High Voltage'; Specifications tab, 'Power'; Specifications tab, 'Battery Life' … Checked 2026-10-16