Ludlum 78

Handheld survey meter

Ludlum 78 – handheld survey meter from Ludlum Measurements. Weight as specified: 2.9 kg, including batteries.

Weight as specified: 2.9 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	2 energy-compensated GM tubes1

Performance

Linearity	±10 %1

Measuring range

Energy response	Within 25% of true value from 60 keV to 3 MeV1
Measurement range	0.1 mR/hr to 1000 R/hr1

Power & battery

Power supply	2 "D" batteries1
Battery life and conditions	Typically 250 hours with alkaline batteries1

Mechanical

Dimensions (H × W × L)	12.2 x 10.9 x 105.9 cm retracted; 377.2 cm fully extended1
Weight as specified	2.9 kg, including batteries1

Environment & ratings

Operating temperature	-20 to 50 °C1

General

Meter dial	0–1k, 4-decade logarithmic1

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 78 – Stretch Scope Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Linearity'; Specifications tab, 'Power'; Specifications tab, 'Battery Life'; Specifications tab, 'Temperature Range' … Checked 2026-10-16