Ludlum 9-3

Handheld survey meter

Ludlum 9-3 – 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

Chamber volume	220 cm³1
Window area	40 cm² (31.5 cm² open with optional 79 % open screen)1
Detector	Air ionization chamber (carbon-coated acrylic chamber)1

Performance

Linearity	±10 %1

Measuring range

Response time	Approximately 5 s for 90% of final meter deflection on the x1 and x10 scales, and 2 s on the x100, x1k, and x10k scales1
Measurement range	0.002 to 500 mSv/h (0.2 to 50,000 mR/hr), typical1
Energy response	Within 20% of true value from 40 keV to 2 MeV1
Range multipliers	×1, ×10, ×100, ×1k, ×10k1

Power & battery

Power supply	2 “AA” batteries1
Battery life and conditions	Without display light: 1,050 hours on ×100 and higher ranges at full scale; 1,500 hours on ×1 and ×10 in low background1

Mechanical

Dimensions (H × W × L)	23.4 × 8.9 × 21.6 cm, including instrument handle1
Weight as specified	1.6 kg, including batteries1

Environment & ratings

Operating temperature	-20 to 50 °C; temperature compensation maintains calibration within 15 % of the 25 °C reading1

General

Meter dial	0–5 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

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 9-3 – Ion Chamber Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Chamber Volume'; Specifications tab, 'Linearity'; Specifications tab, 'Power'; Specifications tab, 'Temperature Range' … Checked 2026-10-16