Ludlum 79/2

Handheld survey meter

Ludlum 79/2 – handheld survey meter from Ludlum Measurements. Detector: Internal energy-compensated GM detector. Enclosure rating and conditions: IP65.

Detector: Internal energy-compensated GM detector1
Enclosure rating and conditions: IP651
Weight as specified: 1.4 kg, including batteries and shoulder strap1

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	Internal energy-compensated GM detector1

Performance

Linearity	±15 % full range (dose rate)1

Measuring range

Response time	User-selectable from 1 to 60 seconds, Auto-Response Rate FAST or SLOW, or Fixed FAST and SLOW1
Measurement range	0.001 mSv/h to 0.04 Sv/h (0.1 mR/hr to 4 R/hr)1
Energy response	Within 25% of true value from 60 keV to 3 MeV1

Power & battery

Power supply	Two alkaline or two rechargeable “AAA” batteries (instrument does not support in-device charging)1
Battery life and conditions	Approximately 100 hours of operation1

Mechanical

Dimensions (H × W × L)	20.3 x 8.1 x 114 cm retracted, 4.5 m fully extended1
Weight as specified	1.4 kg, including batteries and shoulder strap1

Environment & ratings

Operating temperature	-20 to 50 °C1
Enclosure rating and conditions	IP651

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 79/2 – Stretch Scope Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector'; Specifications tab, 'Linearity'; Specifications tab, 'Power'; Specifications tab, 'Battery Life' … Checked 2026-10-16