Low Resistance · Micro-Ohm Meters

MR-253A Digital Micro-Ohm Meter (4-Terminal Kelvin)

Bench-top digital micro-ohm meter with 4-terminal (Kelvin) measurement - 1999 µΩ to 19.99 kΩ across 8 ranges. 7-segment LED display.

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CIE® Guarantee

CIE® Registered Trade Mark
Calibrated Before Despatch
12-Month Warranty
Made in India
Custom Ranges Available

About This Instrument

The MR-253A (formerly catalogued as MR-253) is a compact, precision bench-top micro-ohm meter for measuring low values of resistance - in cables, transformer and motor windings, switch and relay contact resistance, PCB track resistance, and ammeter shunt wire calibration. It uses a four-terminal (Kelvin) measurement technique that eliminates errors from lead and contact resistance, which is critical for accurate measurement in the microohm-to-kiloohm range. Displayed on a 3½-digit, 1999-count seven-segment LED display. Test current varies automatically by range, from 2 A (lowest resistance range) down to 0.01 mA (highest range). Accuracy: ±0.5% ±2 digits. Built using MOS LSI technology. Mains powered, 230 V, 50 Hz. Dimensions: 285 × 210 × 100 mm. Weight: 2.8 kg. Supplied with 2 pairs of test leads.

Technical Specifications

Specification	Value
Display	3½-digit, 1999 counts, seven-segment LED
Measurement Technique	4-terminal (Kelvin) - eliminates lead and contact resistance error
Accuracy	±0.5% ±2 digits
Range	1999 µΩ / 19.99 mΩ / 199.9 mΩ / 1999 mΩ / 19.99 Ω / 199.9 Ω / 1999 Ω / 19.99 kΩ
Test Current	Automatically varies by range: 2 A (1999 µΩ range), 1 A on the next two ranges, down to 0.01 mA (kΩ range)
Power	230 V, 50 Hz, single phase
Dimensions	285 × 210 × 100 mm (approx.)
Weight	2.8 kg (approx.)
Accessories	2 pairs of test leads (supplied)
Warranty	12 months against manufacturing defects only

Measurement Ranges

Range	Resolution	Test Current
0–1999 µΩ	1 µΩ	2 A
0–19.99 mΩ	0.01 mΩ	1 A
0–199.9 mΩ	0.1 mΩ	1 A
0–1999 mΩ	1 mΩ	0.1 A (100 mA)
0–19.99 Ω	0.01 Ω	0.01 A (10 mA)
0–199.9 Ω	0.1 Ω	0.001 A (1 mA)
0–1999 Ω	1 Ω	0.0001 A (0.1 mA)
0–19.99 kΩ	0.01 kΩ	0.00001 A (0.01 mA)

All ranges available on a single instrument.

What's Included

2 pairs of test leads

Key Applications

Cable and wire resistance measurement
Transformer and motor winding resistance checks
Switch and relay contact resistance testing
PCB track resistance testing and ammeter shunt calibration

12-Month Warranty · Direct After-Sales Support

Every CIE® instrument carries a 12-month warranty against manufacturing defects only. After-sales support is handled directly by CIE - not a distributor network. Non-standard ranges or custom specifications can be manufactured to your requirement.