# B&K Precision 388B Handheld Digital Multimeter # B&K Precision 388B Handheld Digital Multimeter ## Key Features At A Glance - CAT III 1000 V on all models, with CAT IV 600 V added on the 392 and 393 - AC/DC voltage and current measurement across the series; all current ranges fused - True RMS reading on the 391A, 392, and 393 models - Resistance, capacitance, frequency, diode check, and audible continuity functions - Temperature measurement via thermocouple probe on the 390A, 392, and 393 - Display resolution spanning 4,000-count up to 60,000-count across the series - USB interface with PC software on the 390A and 393 - Ruggedized double injection molded case, auto power off, and three-year warranty The Test Bench Series from B&K Precision is a line of handheld digital multimeters built around high performance at a value price, offering more measurement features for the dollar. Beyond voltage and current, the meters measure capacitance, frequency, and temperature, and add component test, diode test, and logic indicator capabilities. A double injection molded case provides improved grip and protection across the range, and a chart distinguishes which meter best fits a given need. A digital multimeter is the most universal instrument on an electronics bench, consolidating voltage, current, resistance, and continuity checks into a single handheld tool for circuit verification and troubleshooting. Within the Test Bench Series, that core role is extended with diode check, audible continuity, and logic indication, supporting both general electrical measurement and component-level testing. ValueTronics stocks and holds its own inventory in a 20,000 square foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. ## Compare Other Models in This Series The Test Bench Series groups several handheld digital multimeters that share a common ruggedized platform while differing in resolution, accuracy, and measurement functions, so a buyer can select the meter that best fits the application. All models measure AC/DC voltage and current and carry a CAT III 1000 V rating, with the 392 and 393 adding CAT IV 600 V. Across the series the meters combine core electrical measurement with capacitance, frequency, temperature, diode test, and component or logic testing on the models equipped for each, all housed in a double injection molded case for improved grip and protection. Each model in the series links to its own dedicated product page with new pricing matched to that unit. Compare the models below to identify the resolution, accuracy, and feature set that fits your measurement needs before selecting a specific new meter. The models separate primarily by display resolution and accuracy: the 392 and 393 offer a 60,000-count display with 0.08% basic DC accuracy and True RMS, the 391A a 20,000-count display with 0.05% accuracy and True RMS, while the 390A, 389A, and 388B use 4,000-count displays at 0.1%, 0.25%, and 0.5% basic DC accuracy respectively. Feature availability also varies by model — capacitance, temperature, relative mode, and min/max hold appear on some models but not others, USB is available on the 390A and 393, the 388B adds transistor (hFE) test, and the 391A and 388B include a logic probe. See the comparison table for the exact function set of each model. Model Display Count Basic DC Accuracy True RMS **388B** 4000, 3 3/4 ±(0.5% rdg + 1 dgt) No 392 60000, 4 5/6 ±(0.08% rdg + 5 dgt) Yes 393 60000, 4 5/6 ±(0.08% rdg + 5 dgt) Yes 391A 20000, 4 1/2 ±(0.05% + 3 dgt) Yes Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - 9 V battery - Test leads - Instruction manual ## Product Core & Specifications Specification Value Voltage DC Ranges 400 mV, 4 V, 40 V, 400 V, 1000 V AC Ranges 400 mV, 4 V, 40 V, 400 V, 750 V Resolution 100 µV, 1 mV, 10 mV, 100 mV, 1 V Basic DC Accuracy ±(0.5% rdg + 1 dgt) Overload Protection 1200 VDC or AC rms; 500 VDC/AC rms 15 sec on 200 mV range Input Impedance 10 MΩ Current Ranges 400 mA, 4 mA, 40 mA, 400 mA, 2 A, 20 A\* Resolution 100 nA, 1 µA, 10 µA, 100 µA, 1 mA, 10 mA DC Accuracy 400 µA - 400 mA: ±(1% rdg + 1 dgt); 2 A: ±(1.5% rdg + 1 dgt); 20 A: ±(3% rdg + 3 dgt) AC Accuracy 400 µA - 400 mA: ±(1.5% rdg + 1 dgt); 2 A: ±(2% rdg + 4 dgt); 20 A: ±(3.5% rdg + 4 dgt) Input Protection µA/mA input: 2 A/600 V fast blow ceramic fuse; 20 A input: 20 A/600 V fast blow ceramic fuse Max. Burden Voltage 600 mV (900 mV on 2 A, 20 A ranges) Resistance Ranges 400 Ω, 4 kΩ, 40 kΩ, 400 kΩ, 4 MΩ, 40 MΩ Resolution 100 mΩ, 1 Ω, 10 Ω, 100 Ω, 1 kΩ, 10 kΩ Accuracy 400 Ω: ±(1% rdg + 4 dgt); 4 kΩ to 4 MΩ: ±(0.8% rdg + 4 dgt); 40 MΩ: ±(2% rdg + 5 dgt) Open Circuit Voltage 0.6 VDC typ. (3.2 VDC on 400 Ω range) Overload Protection 500 VDC or 500 AC rms Diode Test Diode Test Tested at 1 mA, 3.2 VDC max. typical; ±(1.5% rdg + 3 dgt) accuracy Transistor Test (hFE) Transistor Test (hFE) hFE range: 0 - 1000, hFE base current: 10 µADC Capacitance Ranges 4 nF, 40 nF, 400 nF, 4 µF, 40 µF Resolution 0.1 pF, 1 pF, 10 pF, 100 pF, 1 nF Accuracy ±(3% rdg + 4 dgt) Test Voltage <3.5 V Overload Protection 500 VDC or AC rms Frequency Ranges 4 kHz, 40 kHz, 400 kHz, 4 MHz Resolution 1 Hz, 10 Hz, 100 Hz, 10 kHz Accuracy ±(0.1% + 2 dgt) Sensitivity 250 mVrms min. on 10 Hz to 1 MHz; 500 mVrms min. on 1 MHz to 4 MHz Minimum Pulse Width \>2 µs Overload Protection 500 VDC or 500 AC rms Logic Test Logic Threshold Hi: 2.8±0.8 V, Lo: 0.8 ± 0.5 V Frequency Response 20 MHz Pulse Width 25 ns Pulse Limits \>20% and <80% Indication 40 ms beep at logic 1 (Hi) Overload Protection 500 V DC or 500 AC rms General Display 4000 count, 3 3/4 digit LCD Polarity Automatic, positive implied, negative polarity indication Operating Temperature 32° to 122° (0° to 50°C), 0 to 70% R.H. Dimensions (HxWxD) 7.8 x 3.5 x 1.57" (198 x 90 x 40 mm) Warranty Three-Year Warranty > **Important:** 20 A current input: 10 A continuous, 20 A for 30 seconds maximum. > **Important:** The 20 A current range (marked \*) is rated for 10 A continuous; 20 A measurements are limited to a maximum of 30 seconds. > **Important:** Safety ratings: CAT III 1000 V on all models; CAT IV 600 V on models 392 and 393. > **Important:** The thermocouple probe required for temperature measurement is supplied only with models 390A, 392, and 393; software and the USB interface cable are supplied only with models 390A and 393. ## About this New unit This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order. 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:** 175.0 USD - **Vendor:** B&K Precision - **Type:** Multimeter - **Tags:** BK Precision, Manufacturers, Meters & DAQ, Multimeter, product_manual_group_1, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 175.00 USD | In stock | ## Images - 388B BK Precision Multimeter --- > Source: [ValueTronics](https://valuetronics.com/products/388b-b-k-precision-multimeter-new) > Updated: 2026-06-27