Keithley 6485 Picoammeter measure ultra-low currents (20 pA to 20 mA) with 5 ½-digit resolution, high accuracy, and built-in electrometer.
In professional metrology and circuit design, accuracy is non-negotiable. Our selection of benchtop digital multimeters (DMM) provides the high-resolution measurement capabilities required for precise voltage, current, and resistance analysis. Designed for stability and repeatability, these instruments offer the digit depth and low-burden voltage necessary for sensitive low-power measurements and rigorous laboratory standards. Whether you are performing high-speed automated testing or manual component verification, our curated range of DMMs ensures superior signal integrity and long-term calibration reliability. Explore our inventory of industry-standard meters to find the precision and interface options your workstation demands.
5.5 to 8.5-Digit High-Resolution DMMs
Ultra-Low Current & Nano-Volt Sensitivity
Advanced True RMS & 4-Wire Resistance
New, Used & Refurbished Equipment
ISO 17025 & NIST-Traceable Calibration
USB, LAN & GPIB Data Logging Integration
Image | Brand | Name | Description | Price |
|---|---|---|---|---|
 | Keithley | Keithley 2110 Multimeter with Type K Thermocouple offers 5.5-digit accuracy for voltage, current, resistance, and temperature. | $695.00 | |
 | Keithley | Keithley 2015 THD Multimeter measures harmonic distortion from 20 Hz–20 kHz with USB, LAN, and touchscreen for efficient signal analysis. | $1,495.00 | |
 | Keithley | Keithley 6485 Picoammeter measure ultra-low currents (20 pA to 20 mA) with 5 ½-digit resolution, high accuracy, and built-in electrometer. | $1,995.00 | |
 | Keysight | Keysight 34420A Nano Volt Micro-Ohmmeter with 7.5-digit resolution, 1 nΩ sensitivity, and 2/4-wire measurement modes for ultra-low resistance testing. | $2,795.00 | |
 | Keysight | Keysight B2985A Electrometer/High Resistance Meter with 0.01 fA current sensitivity, 1000V voltage range, and built-in voltage and current source for precise measurements. | $4,995.00 | |
 | Keysight | Keysight 3458A Digital Multimeter 8 ½ digits delivers precise, fast measurements with low noise for demanding lab and industrial uses. | $6,995.00 |
Our collection includes industry-leading benchtop multimeters ranging from 5.5-digit general purpose units to 8.5-digit metrology standards. We provide both Keithley and Keysight (Agilent) instruments including picoammeters, electrometers, and nanovolt meters for specialized electrical testing requirements. All equipment is available as new or certified pre-owned with calibration options.
| Specifications | Keithley 2110 | Keithley 2015 | Keithley 6485 | Keysight 34420A | Keysight B2985A | Keysight 3458A |
|---|---|---|---|---|---|---|
| Resolution | 5.5 Digits | 6.5 Digits | 5.5 Digits | 7.5 Digits | 6.5 Digits | 8.5 Digits |
| Primary Application | General Purpose / Temperature Testing | Audio & Signal Analysis (THD) | Ultra-Low Current Measurement | Ultra-Low Resistance Testing | High Resistance / Electrometer / Insulation Resistance Testing | High-Speed Precision Lab Std. / Data Acquisition |
| Sensitivity & Range | 100 nV Voltage 10 nA Current sensitivity | THD Analysis 20 Hz to 20 kHz range | 10 fA Resolution 20 pA to 20 mA range | 100 pV / 100 nΩ 1 mV to 100 V range | 0.01 fA Resolution Up to 1000V voltage source | 10 nV Resolution 0.6 ppm/yr DCV accuracy |
| Technical Features | Dual display, Type K thermocouple support, 15 functions | Built-in sine wave generator, 13 DMM functions | Voltage burden <200 μV, Built-in IEEE-488 | 2/4-wire offset compensated ohms, SPRT support | Battery operation option, time-domain view | 100,000 rdgs/s at 4.5 digits, 8 ppm 1-yr ACV |
| Connectivity | USB (GPIB optional) | RS-232, GPIB | RS-232, IEEE-488 | RS-232, GPIB | USB, LAN, GPIB, LXI | GPIB |
| Price (USD) | $695.00 | $1,495.00 | $1,995.00 | $2,795.00 | $4,995.00 | $6,995.00 |
Choosing the right Digital Multimeter (DMM) for your laboratory or production line is a balance between required precision, measurement speed, and budget. While a standard handheld DMM is sufficient for basic continuity, benchtop units provide the stability and resolution necessary for high-stakes electrical engineering.
The “Digits” of a DMM tell you how many discrete values the meter can display.
Beyond standard Voltage and Resistance, many of the instruments in our inventory serve specific niches:
In an automated test environment (ATE), speed is critical. The Keysight 3458A is legendary not just for its 8.5-digit accuracy, but for its ability to perform 100,000 readings per second at 4.5 digits. When comparing models, check the Readings Per Second (rdgs/s) spec to ensure your throughput remains high.
At Micro Precision Test Equipment, we offer both new and certified used equipment. High-end DMMs from Keithley and Keysight are built for decades of service. Purchasing a refurbished unit allows your lab to access 7.5 or 8.5-digit precision at a fraction of the original MSRP, provided it includes a fresh ISO 17025 calibration.
In a professional calibration environment, a digital multimeter (DMM) is the primary tool for verifying circuit performance and signal integrity. Beyond basic measurements, high-precision benchtop DMMs are used to detect minute signal drifts and characterize electrical components under lab-controlled conditions. At Micro Precision, we utilize these instruments to ensure that every piece of electrical test equipment meets stringent ISO 17025 standards, providing a level of accuracy that handheld consumer meters simply cannot reach.
Continuity testing is about verifying a low-impedance path between two points. To perform a professional-grade check, set your DMM to the continuity mode, but pay close attention to the resistance threshold—high-end benchtop meters allow you to adjust this beep-threshold for precise cable assembly testing. Always verify your probe integrity first by shorting the leads to ensure a 0Ω reading, ensuring no ‘ghost’ resistance is masking a failing connection in sensitive high-frequency circuits.
Effective use of a lab-grade DMM begins with selecting the correct resolution and input impedance for your target circuit. For instance, when measuring high-impedance nodes, selecting a meter with >10GΩ input resistance prevents ‘loading’ the circuit and giving a false reading. Start by grounding yourself to prevent ESD (Electrostatic Discharge), select your primary function (DCV, ACV, or Ohms), and always ensure your meter has a current Calibration Certificate to guarantee that the data you are collecting is legally and technically traceable.
To accurately test a capacitor, you must first ensure it is fully discharged to protect the DMM’s internal circuitry. While many DMMs have a capacitance mode, high-end benchtop models like the Keysight 3458A allow for more nuanced testing by measuring the ‘charge time constant’ or leakage current. If you are testing for ESR (Equivalent Series Resistance), which is a common failure point in aged power supplies, you may require a specialized LCR meter or a DMM with high-frequency sampling capabilities to ensure the component is truly within its original design tolerance.
For precision resistance measurements, especially below $100\Omega$, standard 2-wire testing is often inaccurate due to the resistance of the test leads themselves. To achieve laboratory accuracy, we recommend using 4-Wire (Kelvin) Ohms measurement. By using four leads instead of two, the meter cancels out lead resistance, allowing you to measure milliohms with extreme precision. This is critical when testing shunt resistors or high-current busbars where even a tiny error can lead to significant thermal issues in the final application.