Ludlum 35

Handheld survey meter

Ludlum 35 – handheld survey meter from Ludlum Measurements. Weight as specified: 174 g.

Enclosure rating and conditions: IP52 with Audio Hole Seal option (reduces maximum volume by approx. 10 dB)1
Weight as specified: 174 g1

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 or scintillation detectors (default BNC connector – others available)1

Measuring range

Response time	User-selectable from 1 to 60 seconds, auto-response rate FAST or SLOW, or Fixed FAST and SLOW1

Electronics & signal

Detector bias	400 to 1500 Vdc1

Connectivity & interface

Display range	0.0 cps–99.9 kcps; 0.00 cpm–999 kcpm; 0.00 Bq–99.9 kBq; 0.00 dpm–999 kdpm; 0.00 µR/h–999 R/h; 0.00 µrem/h–999 rem/h; 0.00 µSv/h–999 Sv/h1

Power & battery

Power supply	Internal: two alkaline or two rechargeable “AAA” batteries; external: 10 to 24 V through optional powered mount1
Battery life and conditions	Approximately 100 hours of operation2

Mechanical

Dimensions (H × W × L)	8.5 x 8.0 x 4.8 cm1
Weight as specified	174 g1

Environment & ratings

Operating temperature	-20 to 50 °C1
Enclosure rating and conditions	IP52 with Audio Hole Seal option (reduces maximum volume by approx. 10 dB)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 35 Vehicle Radiation MonitorDatasheet · 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 35 – Vehicle-Mounted Digital Survey Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Compatible Detectors'; Specifications tab, 'High Voltage'; Specifications tab, 'Power'; Specifications tab, 'Temperature Range' … Checked 2026-10-16
2
Model 35 Vehicle Radiation Monitor
Publisher: Ludlum MeasurementsDatasheet Specifications, 'BATTERY LIFE' Checked 2026-10-16