Ludlum 18

Handheld survey meter

Ludlum 18 – handheld survey meter from Ludlum Measurements. Weight as specified: 1.6 kg including batteries.

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

Compatible external detectors	GM, proportional, scintillation1

Performance

Linearity	±10 % of true value with detector connected2

Measuring range

Measurement range	Dependent on detector1
Range multipliers	×1, ×10, ×100, ×10001

Electronics & signal

Detector bias	Three independent settings, adjustable from 400 to 2500 Vdc2

Connectivity & interface

Detector connector	Type "C" series (others available)1

Power & battery

Power supply	Two "D" cell batteries1
Battery life and conditions	600 hours1

Mechanical

Dimensions (H × W × L)	16.5 × 8.9 × 21.6 cm, including handle1
Weight as specified	1.6 kg including batteries1

Environment & ratings

Operating temperature	-20 to 50 °C1

General

Meter dial	0–500 cpm, 0–2.5 kV, BAT TEST (other meter faces available)1

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

Documents

PDFModel 18 General Purpose Ratemeter (data sheet)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 18 General Purpose Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Compatible Detectors'; Specifications tab, 'Power'; Specifications tab, 'Battery Life'; Specifications tab, 'Temperature Range' … Checked 2026-10-16
2
Model 18 General Purpose Ratemeter (data sheet)
Publisher: Ludlum MeasurementsDatasheet Specifications, 'High Voltage'; Specifications, 'Linearity' Checked 2026-10-16