# Agilent U1251A 50,000 Count Dual-Display True-RMS Handheld Digital Multimeter (Pre-Owned)

# Agilent U1251A 50,000 Count Dual-Display True-RMS Handheld Digital Multimeter (Pre-Owned)

## Key Features At A Glance

-   50,000-count, 4.5-digit dual display with high-contrast blue LED backlighting
-   True-RMS AC and AC+DC voltage and current measurement
-   Up to 0.025% basic DC voltage accuracy across the series
-   CAT III 1000 V overvoltage protection (IEC 61010 compliant)
-   Thermocouple temperature and capacitance measurement functions
-   Built-in frequency counter with duty-cycle and pulse-width measurement
-   Manual and automatic data logging with included GUI datalogging software
-   Rugged shock-absorbing overmold; full accuracy from –20 °C to +55 °C

The Agilent U1250A Series is a handheld digital multimeter line comprising the U1251A and U1252A, delivering 4.5-digit resolution with a 50,000-count full-scale dual display and high-contrast blue backlighting. Both models take accurate true-RMS readings and reach a basic DC voltage accuracy of up to 0.025%, giving the flexibility to perform quick validation measurements as well as tolerance checks and marginal-failure troubleshooting. Beyond conventional multimeter functions, the series integrates capabilities normally associated with a benchtop instrument into a single rugged handheld package.

Marketed as a 4-in-1 instrument for today's challenging maintenance environment, the series combines a full-featured digital multimeter with a frequency counter, a programmable square wave generator for stimulation of electronic digital circuits, and a thermometer function. Rated at CAT III 1000 V (IEC 61010 compliant), the meters allow measurements on building electrical installations at locations between the main circuit breaker and the mains socket-outlets, including measurements on equipment that is permanently connected to the main circuits. Accurate true-RMS measurement together with sophisticated math functions helps increase confidence in fault findings and further reduce measurement errors.

ValueTronics stocks and holds its own inventory in a secure, 20,000-square-foot warehouse at 1675 Cambridge Drive in Elgin, Illinois, which means the instruments we list are physically on hand and ready to ship. Our test-and-measurement specialists inspect and functionally verify every pre-owned unit in-house before it leaves the building, while new units ship factory-sealed exactly as received from the manufacturer.

## Brand Heritage

Agilent Technologies was established in 1999 as a spin-off of Hewlett-Packard's test-and-measurement business. In 2014, that electronic measurement business was established as Keysight Technologies, which carries the product lineage forward today.

## Compare Other Models in This Series

The Agilent U1250A Series brings benchtop-class capability into a handheld form factor, pairing a 50,000-count, 4.5-digit dual display with true-RMS measurement and a basic DC voltage accuracy reaching 0.025%. The series is built around a 4-in-1 concept that adds a frequency counter, a programmable square wave generator, and a thermometer function to a full-featured digital multimeter.

Across the line, the meters share a rugged shock-absorbing overmold, CAT III 1000 V overvoltage protection, a –20 °C to +55 °C operating range, and a 3-year warranty, while differing in measurement accuracy and the specific function set offered on each model. The comparison table below details those differences model by model.

Each pre-owned model linked below is its own dedicated product page with condition-matched pricing, so you can select the exact model and condition your application requires. Review the per-model specifications and the comparison table to confirm the right fit before ordering.

The two models in the series differ in both precision and feature set. The U1252A reaches a basic DC voltage accuracy of 0.025%, while the U1251A is specified at 0.03%, and the U1252A extends true-RMS AC bandwidth to 100 kHz against the U1251A's 30 kHz range. J-type thermocouple support is available on the U1252A in addition to the K-type support shared by both models.

The U1252A additionally provides a programmable square wave generator output, a dedicated frequency counter with divide-by-1 and divide-by-100 modes, AC+DC measurement specifications, and a rechargeable Ni-MH battery with built-in charging, whereas the U1251A is powered by an alkaline 9 V battery. The comparison table below lists each model's functions side by side.

Model

DC Basic Accuracy

True-RMS AC Bandwidth

Thermocouple Types

**U1251A**

0.03%

30 kHz

K

U1252A

0.025%

100 kHz

J, K

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

## Accessories Supplied

-   Soft carrying case
-   Certificate of Calibration (CoC)
-   Test Report
-   Test leads
-   Alligator clips
-   SMT grabbers
-   Mini grabber
-   Fine tip test probes
-   Quick Start Guide
-   Reference CD containing the User's and Service Guide, application software and instrument drivers
-   Alkaline 9 V Battery (U1251A only)

## Product Core & Specifications

Specification

Range

Resolution

Accuracy

DC Voltage Accuracy ± (% of reading + LSD)

Voltage

50.000 mV

0.001 mV

0.05% + 50

Voltage

500.00 mV

0.01 mV

0.03% + 5

Voltage

1000.0 mV

0.1 mV

0.03% + 5

Voltage

5.0000 V

0.0001 V

0.03% + 5

Voltage

50.000 V

0.001 V

0.03% + 5

Voltage

500.00 V

0.01 V

0.03% + 5

Voltage

1000.0 V

0.1 V

0.03% + 5

Resistance Accuracy ± (% of reading + LSD)

Resistance (1.04 mA)

500.00 Ω

0.01 Ω

0.08% + 10

Resistance (416 µA)

5.0000 kΩ

0.0001 kΩ

0.08% + 5

Resistance (41.2 µA)

50.000 kΩ

0.001 kΩ

0.08% + 5

Resistance (4.12 µA)

500.00 kΩ

0.01 kΩ

0.08% + 5

Resistance (375 nA)

5.0000 MΩ

0.0001 MΩ

0.2% + 5

Resistance (187 nA)

50.000 MΩ

0.001 MΩ

1% + 10

Resistance (187 nA)

500.00 MΩ

0.01 MΩ

N/A

Conductance (187 nA)

500.00 nS

0.01 nS

1% + 20

DC Current Accuracy ± (% of reading + LSD)

Current (0.06 V burden, 100 Ω)

500.00 µA

0.01 µA

0.1% + 5

Current (0.6 V burden, 100 Ω)

5000.0 µA

0.1 µA

0.1% + 5

Current (0.09 V burden, 1 Ω)

50.000 mA

0.001 mA

0.2% + 5

Current (0.9 V burden, 1 Ω)

440.00 mA

0.01 mA

0.2% + 5

Current (0.2 V burden, 0.01 Ω)

5.0000 A

0.0001 A

0.3% + 10

Current (0.4 V burden, 0.01 Ω)

10.000 A

0.001 A

0.3% + 5

Diode Test

Diode Test (1.04 mA)

—

0.1 mV

0.05% + 5

True-RMS AC Voltage Accuracy ± (% of reading + LSD)

50.000 mV (30 Hz–45 Hz / 45 Hz–1 kHz / 1–10 kHz / 10–30 kHz)

0.001 mV

—

1.0+60 / 0.6+40 / 1.0+40 / 1.6+60

500.00 mV–50.000 V (45 Hz–1 kHz / 1–10 kHz / 10–30 kHz)

—

—

0.6+25 / 1.0+25 / 1.6+40

500.00 V (10–30 kHz)

0.01 V

—

1.6+40

1000.0 V (45 Hz–1 kHz / 1–10 kHz / 10–30 kHz)

0.1 V

—

0.6+40 / 1.0+40 / N/A

AC Current Accuracy ± (% of reading + LSD)

500.00 µA (30 Hz–45 Hz / 45 Hz–2 kHz / 2–20 kHz)

0.01 µA

—

1.5+50 / 0.8+20 / 3.0+80

5000.0 µA–440.00 mA (30 Hz–45 Hz / 45 Hz–2 kHz / 2–20 kHz)

—

—

1.5+40 / 0.8+20 / 3.0+60

5.0000 A–10.000 A (45 Hz–2 kHz / 2–20 kHz)

—

—

2.0+40 / 3+60 (<3 A/5 kHz)

Temperature

Thermocouple Type K

\-200 ~ 1372 °C / -328 ~ 2502 °F

0.1 °C / 0.1 °F

0.3% + 3 °C / 0.3% + 6 °F

Capacitance

Capacitance

10.000 nF

0.001 nF

1% + 8

Capacitance

100.00 nF

0.01 nF

1% + 5

Capacitance

1000.0 nF

0.1 nF

1% + 5

Capacitance

10.000 µF

0.001 µF

1% + 5

Capacitance

100.00 µF

0.01 µF

1% + 5

Capacitance

1000.0 µF

0.1 µF

1% + 5

Capacitance

10.000 mF

0.001 mF

3% + 10

> **Important:** Current can be measured up to 10 A continuously; an additional 0.5% accuracy applies to signals from 10 A to 20 A for 30 seconds maximum, and after measuring a current above 10 A the meter should be left to cool for twice the measuring time used.

> **Important:** Measurement category derates with altitude: CAT III 1000 V from 0 to 2000 m and CAT III 600 V from 2000 to 3000 m, per IEC 61010-1 2nd Edition.

> **Important:** Always use the NULL function to zero out the thermal effect with open test lead before measuring; if the NULL function is not used, an additional 20 counts must be added to the DC current accuracy.

> Recommended pairing: connect to a PC with the optional Agilent U1173A IR-to-USB cable to use the included datalogging software for automatic logging.

## About this Pre-Owned unit

This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects.

-   Warranty included
-   Functional verification included
-   Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
-   Note that unnecessary accessories may not be included (contact Test Architect to confirm).

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 0.0 USD
- **Vendor:** Agilent
- **Type:** Multi Met
- **Tags:** Agilent, Agilent Keysight, Manufacturers, Meters & DAQ, Multimeter, product_manual_group_3, Product_used

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 0.00 USD | In stock |

## Images

- U1251A Agilent Keysight HP Multimeter

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> Source: [ValueTronics](https://valuetronics.com/products/u1251a-agilent-multimeter-used)
> Updated: 2026-06-20