Ludlum 3-IS-1

Handheld survey meter

Ludlum 3-IS-1 – handheld survey meter from Ludlum Measurements. Detector: Energy-compensated GM. Weight as specified: 1.6 kg, including batteries.

Detector: Energy-compensated GM1
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	Energy-compensated GM1

Performance

Linearity	±10 %1

Measuring range

Measurement range	0.1 mR/hr to 1.0 R/hr1
Range multipliers	×0.1, ×1, ×10, ×1001

Power & battery

Power supply	Two “D” cell batteries (use only Duracell Procell PC1300 1.5 V type “D”)1
Battery life and conditions	Typically greater than 2000 hours with alkaline batteries1

Mechanical

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

Environment & ratings

Operating temperature	-20 to 40 °C1

General

Meter dial	0 to 10 mR/hr, BAT TEST1

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 3-IS Series Intrinsically Safe Survey MetersDatasheet · 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 3-IS-1 – Intrinsically Safe Gamma Ratemeter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector'; Specifications tab, 'Linearity'; Specifications tab, 'Power' and WARNING note; Specifications tab, 'Battery Life' … Checked 2026-10-16