UNI-T UT58B 2000-Count General Digital Multimeter: The Ultimate Guide

Overview

The UNI-T UT58B is a versatile and reliable digital multimeter from the renowned UT58 series, designed to meet the needs of both professionals and electronics enthusiasts . This high-quality instrument combines comprehensive measurement capabilities—including temperature, capacitance, and transistor (hFE) testing—in a rugged, user-friendly package, making it an indispensable tool for electrical troubleshooting, electronics repair, and general maintenance .

Engineered with a large-scale integrated circuit and a dual-slope A/D converter, the UT58B delivers stable and accurate measurements across a wide range of parameters . Its large 60×54mm LCD display ensures clear data reading in any environment, while the rugged, impact-resistant holster protects the meter from drops and impacts . With safety certifications compliant with CAT II 1000V and CAT III 600V (EN 61010), it provides professional-grade protection for work on industrial equipment, commercial systems, and residential circuits .

Key Features at a Glance

• Temperature Measurement: Built-in K-type thermocouple support with included point contact temperature probe for readings from -40°C to 1000°C—essential for HVAC/R diagnostics and appliance repair .

• Capacitance Measurement: Tests capacitors up to 100μF for power supply filtering and motor start capacitors .

• Transistor (hFE) Testing: Dedicated socket for testing NPN/PNP transistor current gain (0~1000β)—rare at this price point .

• Wide Voltage Range: Measures DC voltage up to 1000V and AC voltage up to 750V with high accuracy (DCV ±0.5%+1) .

• High Current Capacity: Measures DC/AC current up to 20A for automotive and industrial applications .

• Resistance up to 200MΩ: Measures high-value resistors and insulation resistance .

• Large Clear Display: 2000-count LCD with 60×54mm screen for excellent readability .

• Manual Ranging with Full Overload Protection: Comprehensive protection against misuse .

• Continuity Buzzer: Acoustic indication with <70Ω threshold for quick circuit checks .

• Diode Test: 1mA test current @ 3V open circuit voltage .

• User-Friendly Features: Data hold, full icon display, low battery indication, and test lead connection indicators .

• Rugged Construction: Impact-resistant holster with tilt stand for comfortable benchtop use .

• Safety Certified: CAT II 1000V / CAT III 600V with double insulation, compliant with EN61010 standards .

Detailed Specifications

The UNI-T UT58B delivers professional-grade accuracy across a comprehensive range of electrical and temperature parameters .

Electrical & Temperature Measurement Specifications

General Characteristics

Special Functions

What's in the Box

Key Functions & Operation

1. Temperature Measurement

• Set the rotary switch to the temperature position

• Connect the included K-type point contact temperature probe to the meter

• Place the temperature probe on or in the object being measured

• Read the temperature value directly from the display

• Range: -40°C to 1000°C for maximum versatility in HVAC, appliance repair, and industrial applications

2. Capacitance Measurement

• Set the rotary switch to the appropriate capacitance position

• Fully discharge capacitors before testing to avoid damage to the meter

• Connect test leads in parallel with the capacitor

• Measures up to 100μF for motor start capacitors and power supply filtering

• Note: The test frequency is approximately 400Hz

3. Transistor (hFE) Testing

• Set the rotary switch to the hFE position

• Determine whether the transistor is NPN or PNP type

• Insert the transistor into the dedicated hFE socket, matching the correct pinout (E, B, C)

• Read the transistor's DC current gain (β) directly from the display (0~1000β)

• Test conditions: Ib≈10μA, Vce≈2.8V

4. DC/AC Voltage Measurement

• Set the rotary switch to the appropriate V position (V--- for DC, V~ for AC)

• Connect test leads: red to VΩ jack, black to COM jack

• Connect test leads in parallel to the circuit under test

• Input impedance is approximately 10MΩ, minimizing circuit loading effects

• Maximum input: 1000V DC / 750V AC rms

5. DC/AC Current Measurement

• Set the rotary switch to the appropriate A position based on expected current (2mA, 20mA, 200mA, or 20A for DC; 2mA, 200mA, or 20A for AC)

• Connect test leads: red to mA jack (for currents up to 200mA) or 20A jack (for currents up to 20A), black to COM jack

• Connect test leads in series with the circuit under test

• Critical Warning: On the 20A range, measurement time should not exceed 10 seconds with a 15-minute interval between measurements to prevent overheating

• The mA ranges are protected by a 0.5A/250V fuse (φ5×20mm)

6. Resistance Measurement

• Set the rotary switch to the appropriate Ω position

• Connect test leads across the resistor

• For low resistance measurements, short test leads to check for zero reading

• On the 200MΩ range, shorting the leads may show a value of approximately 10 digits—subtract this from final measurements

7. Continuity & Diode Testing

• Set the rotary switch to the continuity/diode position

• Continuity Test: Buzzer sounds when resistance is <10Ω (some sources indicate <70Ω)

• Diode Test: Displays forward voltage drop (test current 1mA @ 3V open circuit voltage)

8. Data Hold

• Press the HOLD button to freeze the current reading on the display

• The symbol is displayed and the present value is shown

• Press again to release

• Useful for capturing readings in difficult-to-see locations

9. Test Lead Connection Indicators

• The display shows visual indications of correct test lead connection

• Helps prevent errors and enhances safety during measurements

10. Low Battery Indication

• When the battery voltage drops below operating level, a low battery symbol appears on the LCD

• Replace the 9V battery promptly to maintain measurement accuracy

11. Auto Power Off

• The meter automatically enters sleep mode after a period of inactivity to conserve battery life

• Turn the meter off and on again to resume normal operation

Safety Features

The UT58B incorporates multiple advanced safety features to protect users :

• CAT II 1000V / CAT III 600V Rating: Suitable for measurements on distribution circuits and permanently installed equipment

• Fuse Protection: 0.5A/250V fast-acting fuse on mA ranges (φ5×20mm)

• Full Range Overload Protection: Protects the meter and user during fault conditions

• Input Jack Protective Covers: Prevents accidental contact during measurements

• Double Insulation: Complies with international safety requirements

• Low Battery Indication: Prevents false readings due to insufficient power

• Impact-Resistant Holster: Protects meter from drops and impacts

UT58B vs. Other UT58 Series Models

The UT58 series offers several models with specialized features, with the UT58B serving as a versatile mid-range option :

Applications

The UNI-T UT58B is an ideal all-in-one tool for:

🌡️ HVAC/R & Refrigeration Technicians

• Measuring vent temperatures, superheat, and subcooling with the included thermocouple

• Troubleshooting furnaces, air conditioners, and refrigeration systems

• Testing thermostats, sensors, and heating elements

• Checking start/run capacitors up to 100μF

🔧 Electronics Repair & Engineering

• Testing components on circuit boards

• Measuring transistor gain (hFE) for matching pairs—essential for audio and precision circuits

• Capacitance measurement for timing circuits and power supply filtering

• Diode and continuity testing for PCB troubleshooting

⚡ Electrical & Industrial Maintenance

• Troubleshooting control panels and equipment up to 1000V

• Measuring current on circuits up to 20A

• Continuity checking for wiring and connections

• Diode testing for rectifiers and semiconductors

🚗 Automotive Diagnostics

• Testing car battery voltage (12V/24V systems)

• Checking alternator output

• Testing fuses and relays

• Temperature monitoring of engine components (with thermocouple)

🏠 DIY & Home Workshop

• Testing household outlets and batteries

• Electronics projects and circuit debugging

• Appliance repair and troubleshooting

• General electrical measurements

Why Choose the UNI-T UT58B?

The UT58B stands out as a versatile, feature-rich workhorse that adds temperature and capacitance measurement to essential electrical testing capabilities .

Key Differentiators:

Customer Reviews Summary

Users consistently praise the UT58B for:

• Build Quality: "Прочный корпус и удобный холстер" (Rugged body and comfortable holster)

• Accuracy: Reliable measurements with ±(0.5%+1) DCV accuracy

• Temperature Function: Highly valued by HVAC technicians for furnace and AC diagnostics

• hFE Testing: Essential for electronics enthusiasts and component matching

• Value for Money: "Отличное соотношение цена/качество" (Excellent price/quality ratio)

• Ease of Use: Intuitive controls and clear display

Limitations to Consider

• Manual Ranging Only: Requires manual range selection (no auto-ranging convenience)

• No True RMS: Uses average responding measurement—not suitable for non-linear loads

• No Frequency: Does not measure frequency (available on UT58C and UT58E)

• 20A Range Timing: Must limit measurements to ≤10 seconds with 15-minute intervals

• No Backlight: Most sources indicate no backlight (check specific distributor)

• 9V Battery: Uses 9V battery (6F22) instead of more common AAA batteries

Final Verdict

The UNI-T UT58B is a versatile, durable, and feature-packed digital multimeter that delivers exceptional value for users who need temperature measurement and capacitance testing in addition to standard electrical functions. Its included K-type thermocouple, 100μF capacitance range, and hFE transistor testing make it an excellent choice for HVAC technicians, electronics enthusiasts, and maintenance professionals .

While it requires manual ranging and lacks True RMS (available in newer models like the UT39E+), the UT58B excels where it matters most: accurate, reliable measurements across a wide range of parameters in a rugged, safety-certified package . The large 60×54mm display, test lead connection indicators, and included accessories add significant value .