Digital FlexProbe^®

Current Readings Where Clamps Can’t Go

An ideal addition to the electrician’s tool kit, the Digital FlexProbe^® (Models 400D and 4000D) is a flexible-sensor current meter designed to deliver fast, direct, True RMS AC current readings in places where rigid jaws can’t reach. It’s compact, simple to operate, and ideal for troubleshooting and verification inside crowded panels and cabinets.

Choose Your Model

Model 400D – Everyday electrical work

Built for residential, commercial, and light industrial applications, the 400D available with either a (10 or 24) inch sensor, measures from 20 mA to 400 A AC (model dependent), making it a practical tool for checking distribution circuits and loads.

Model 4000D – Industrial + utility current levels

For higher-power environments, the 4000D available with either a (14 or 24) inch sensor, measures from 200 mA to 4000 A AC (model dependent) and is suited for industrial installations and utility work where higher currents are common.

Key Features

Measurement range: 20 mA to 4000 A AC (model dependent)
True RMS for accurate AC current on distorted signals
Flexible current sensor for conductors in tight, hard-to-reach places
Auto-ranging + HOLD for quick capture and stable readings
Resolution down to 1 mA (model dependent)
Frequency range: 10 Hz to 3 kHz
Power: (2) AAA batteries; ~70 hours typical battery life
Safety: 600 V CAT IV; IEC 61010 compliance

Three Reasons You’ll Reach for FlexProbe First

Access: Flexible sensor reaches what clamp jaws can’t.
Trust: True RMS readings across real-world loads.
Quick Workflow: Direct display + HOLD + optional hands-free MultiFix.

Hands-free Option

Optional MultiFix™ universal mounting system (Cat. #5000.44) lets you position the FlexProbe where you need it and keep both hands free.

NOTE: Our complete catalog is not available for direct online purchase, refer to the Status Column for purchasing options. Items that do not have an Add to Cart button must be purchased from an Authorized Distributor.

Model	Cat. #	Description	List Price	Quantity/Status
400D-10	2153.31	Digital FlexProbe^® Model 400D-10 w/6 ft Lead (TRMS, (4, 40, and 400) AAC)) NIST Calibration ($75.00 each)	$336.00
400D-24	2153.36	Digital FlexProbe^® Model 400D-24 w/6ft Lead (TRMS, 4AAC, 40AAC, 400AAC) NIST Calibration ($75.00 each)	$390.00	Consult Factory for Availability
4000D-14	2153.32	Digital FlexProbe^® Model 4000D-14 w/6 ft Lead (TRMS, 40AAC, 400AAC, 4000AAC) NIST Calibration ($75.00 each)	$320.00
4000D-24	2153.35	Digital FlexProbe^® Model 4000D-24 w/6 ft leads (TRMS, 40AAC, 400AAC, 4000AAC) NIST Calibration ($75.00 each)	$430.00

Model	400D-10
Cat. #	2153.31
Description	Digital FlexProbe^® Model 400D-10 w/6 ft Lead (TRMS, (4, 40, and 400) AAC))
List Price	$336.00
NIST Calibration ($75.00 each)

Model	400D-24
Cat. #	2153.36
Description	Digital FlexProbe^® Model 400D-24 w/6ft Lead (TRMS, 4AAC, 40AAC, 400AAC)
List Price	$390.00
Consult Factory for Availability

Model	4000D-14
Cat. #	2153.32
Description	Digital FlexProbe^® Model 4000D-14 w/6 ft Lead (TRMS, 40AAC, 400AAC, 4000AAC)
List Price	$320.00
NIST Calibration ($75.00 each)

Model	4000D-24
Cat. #	2153.35
Description	Digital FlexProbe^® Model 4000D-24 w/6 ft leads (TRMS, 40AAC, 400AAC, 4000AAC)
List Price	$430.00
NIST Calibration ($75.00 each)

Model	400D-10	400D-24	4000D-14	4000D-24
Catalog #	2153.31	2153.36	2153.32	2153.35
ELECTRICAL
Sensor Length	10 in (250 mm)	24 in (600 mm)	14 in (350 mm)	24 in (600 mm)
Sensor Diameter	2.75 in (70 mm)	7.64 in (190 mm)	3.94 in (100 mm)	7.64 in (190 mm)
Cable Length	6 ft (1.8 m)
Current Range	400 A AC		4000 A AC
Measurement Range	(0.020 to 3.999) A, (4.00 to 39.99) A, (40.0 to 399.9) A		(0.20 to 39.99) A, (40.0 to 399.9) A, (400 to 3999) A
Resolution	1 mA, 10 mA, 100 mA		10 mA, 100 mA, 1 A
Frequency Range	10 Hz to 3 kHz
MECHANICAL
Power Supply	(2) 1.5 V AAA / LR3 batteries (included)
Battery Life	70 hours typical (Super-alkaline)
Casing Dimensions	(3.94 x 2.36 x 0.79) in (100 x 60 x 20) mm
Weight	0.29 lbs (130 g)
ENVIRONMENTAL
Operating Temperature	(32 to 122) °F (0 to 50) °C, RH 80 %
Storage Temperature	(-4 to 158) °F (-20 to 70) °C, RH 90 %
Pollution degree	2
SAFETY
Ingress Protection	IP 40
EMC	IEC 61326-1
Safety Compliance	600 V CAT IV, IEC 61010-2-032, Double insulated

User Manuals

Digital FlexProbe Model 400D-4000D

Comparison Charts

Current Probe Selection Chart - English

Current Probe Selection Chart - Español

Application Notes

Glossary of Current Probe Terms

Rogowski Coil Primer

Applications - Graphic Illustrations

Power Distribution (Motor)

Videos

Rogowski Coils Explained

Cat. #	Description	List Price	Quantity/Status
2118.65	Case – Soft Carrying Case for Clamp-on Meters and Multimeters Models (1110, 1227, 1246, 1821, 1822, 1823, 4000D-24 w/6 ft lead, 400D-24 w/6 ft lead) Dimensions: (10.5 x 5 x 2) in	$21.90
2133.72	Small Classic Tool Bag for field use. 12 Exterior and 14 Interior pockets. Dimensions: (13.0 x 9.8 x 9.5) in. For use with PEL Models: PEL 102, PEL 103, PEL 112 & PEL 113, DMM/Oscilloscope/Power Analyzer Model: OX 5042B, Megohmmeters Models: 5050, 5060, 5070 & 6505, 6550 & 6555.Data Loggers Models: DL913 & DL 914.	$39.00
5000.44	MultiFix (universal mounting system) for use with models 5231, 5233, 400D, and 4000D	$19.25	Consult Factory for Availability

Model
Cat. #	2118.65
Description	Case – Soft Carrying Case for Clamp-on Meters and Multimeters Models (1110, 1227, 1246, 1821, 1822, 1823, 4000D-24 w/6 ft lead, 400D-24 w/6 ft lead) Dimensions: (10.5 x 5 x 2) in
List Price	$21.90

Model
Cat. #	2133.72
Description	Small Classic Tool Bag for field use. 12 Exterior and 14 Interior pockets. Dimensions: (13.0 x 9.8 x 9.5) in. For use with PEL Models: PEL 102, PEL 103, PEL 112 & PEL 113, DMM/Oscilloscope/Power Analyzer Model: OX 5042B, Megohmmeters Models: 5050, 5060, 5070 & 6505, 6550 & 6555.Data Loggers Models: DL913 & DL 914.
List Price	$39.00

Model
Cat. #	5000.44
Description	MultiFix (universal mounting system) for use with models 5231, 5233, 400D, and 4000D
List Price	$19.25
Consult Factory for Availability

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Digital FlexProbe^®

Current Readings Where Clamps Can’t Go