Ludlum 2403

Handheld survey meter

Ludlum 2403 – handheld survey meter from Ludlum Measurements. Weight as specified: 0.4 kg including battery.

Measurement range as specified: Detector dependent; typically 0–200 mR/hr, varies with detector and units selected1
Weight as specified: 0.4 kg including battery2

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.

Measuring range

Measurement range as specified	Detector dependent; typically 0–200 mR/hr, varies with detector and units selected1
Sensitivity	Detector dependent2
Response time	Typically 8 s from 10 % to 90 % of final reading2
Energy response	Detector dependent2

Electronics & signal

Detector bias	550 to 900 Vdc2

Power & battery

Power supply	9 V battery2
Battery life and conditions	Typically 250 hours with alkaline battery2

Mechanical

Dimensions (H × W × L)	4.6 × 8.4 × 13.5 cm; length 15.2 cm with connector2
Weight as specified	0.4 kg including battery2

Environment & ratings

Operating temperature	−20 to +50 °C (−4 to 122 °F); may be certified for operation from −40 to +65 °C (−40 to 150 °F)3

General

Alarm	No2

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 2403 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 2403 General Purpose Ratemeter (data sheet)
Publisher: Ludlum MeasurementsDatasheet Specifications, 'Range' Checked 2026-10-16
2
Model 2403 Pocket-Size Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Sensitivity'; Specifications tab, 'High Voltage'; Specifications tab, 'Power'; Specifications tab, 'Battery Life' … Checked 2026-10-16
3
Ludlum Model 2403 manual
Publisher: Ludlum MeasurementsManual Manual p. 14 (p. 5-1), section 5, Environmental Conditions for Normal Use Checked 2026-10-16