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The HT21 is a handheld digital multimeter from HT Instruments (HT Italia SRL), built around a 3½-digit, 4000-point LCD that displays plus sign, decimal point, automatic polarity, and an "OL" overrange indication. A backlight supports reading in low-light conditions, and a low-battery symbol appears when the 9 V cell runs down.
A digital multimeter consolidates the most common bench and field electrical measurements into a single instrument, reading voltage, resistance, and current-related parameters from a circuit or component. The HT21 integrates DC and AC voltage, resistance, diode, continuity, frequency, duty cycle, and capacitance functions, each available as an autoranging measurement so the operator does not need to select a range manually.
ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, so equipment is sourced and shipped directly from our own facility.
| Specification | Value |
|---|---|
| DC Voltage (Autorange) — Accuracy ± (% reading + number of dgt) at 18°C ÷ 28°C, <70%HR; Input impedance: 7.8MΩ; Overload protection: 600VDC/ACrms | |
| 4.000V (Resolution 0.001V) | ±(1.2%rdg+2dgt) |
| 40.00V (Resolution 0.01V) | ±(1.2%rdg+2dgt) |
| 400.0V (Resolution 0.1V) | ±(1.2%rdg+2dgt) |
| 600V (Resolution 1V) | ±(1.5%rdg+2dgt) |
| AC Voltage (Autorange) — Accuracy (50 ÷ 400Hz); Input impedance: 7.8MΩ; Overload protection: 600VDC/ACrms | |
| 4.000V (Resolution 0.001V) | ±(1.2%rdg+4dgt) |
| 40.00V (Resolution 0.01V) | ±(1.5%rdg+3dgt) |
| 400.0V (Resolution 0.1V) | ±(1.5%rdg+3dgt) |
| 600V (Resolution 1V) | ±(2.0%rdg+4dgt) |
| Resistance (Autorange) — Overload protection: 250VDC/ACrms | |
| 400.0Ω (Resolution 0.1Ω) | ±(1.2%rdg+4dgt) |
| 4.000kΩ (Resolution 0.001kΩ) | ±(1.0%rdg+2dgt) |
| 40.00kΩ (Resolution 0.01kΩ) | ±(1.2%rdg+2dgt) |
| 400.0kΩ (Resolution 0.1kΩ) | ±(1.2%rdg+2dgt) |
| 4.000MΩ (Resolution 0.001MΩ) | ±(1.2%rdg+2dgt) |
| 40.00MΩ (Resolution 0.01MΩ) | ±(2.0%rdg+3dgt) |
| Diode Test — Overload protection: 250VDC/ACrms | |
| Resolution 1mV; Open voltage circa 1.5VDC | ±(10%rdg+5dgt) |
| Continuity Test — Overload protection: 250VDC/ACrms | |
| Buzzer | R<150Ω |
| Test current | <0.3VmA |
| Frequency (Autorange) — Sensitivity >8Vrms; Overload protection: 250VDC/ACrms | |
| 5.000Hz (Resolution 0.001Hz) | ±(1.5%rdg+5dgt) |
| 50.00Hz (Resolution 0.01Hz) | ±(1.5%rdg+5dgt) |
| 500.0Hz (Resolution 0.1Hz) | ±(1.2%rdg+3dgt) |
| 5.000kHz (Resolution 10Hz) | ±(1.2%rdg+3dgt) |
| 50.00kHz (Resolution 10Hz) | ±(1.2%rdg+3dgt) |
| 500.0kHz (Resolution 100Hz) | ±(1.2%rdg+3dgt) |
| 5.000MHz (Resolution 1kHz) | ±(1.5%rdg+4dgt) |
| 10.00MHz (Resolution 10kHz) | ±(1.5%rdg+4dgt) |
| Note: on AC Voltage the frequency range is 10Hz ÷ 10kHz; Sensitivity: > 15Vrms | — |
| Duty Cycle (Autorange) — Sensitivity >8Vrms; Overload protection: 250VDC/ACrms; 100µs < pulse duration < 100ms; Frequency range: 5Hz ÷ 150Hz | |
| 0.5 - 99% (Resolution 0.1%) | ±(1.2%rdg + 2dgt) |
| Capacitance (Autorange) — Overload protection: 250VDC/ACrms | |
| 40.00nF (Resolution 0.01nF) | ±(5.0%rdg+7dgt) |
| 400.0nF (Resolution 0.1nF) | ±(3.0%rdg+5dgt) |
| 4.000µF (Resolution 0.001µF) | ±(3.0%rdg+5dgt) |
| 40.00µF (Resolution 0.01µF) | ±(3.0%rdg+5dgt) |
| 100.0µF (Resolution 0.1µF) | ±(5.0%rdg+5dgt) |
| Display | |
| Type | LCD, 3 ½ dgt, 4000 points plus sign and decimal point |
| Polarity | Automatic polarity indication |
| Backlight | Yes |
| Overrange | "OL" overrange indication |
| Features | |
| Functions | HOLD; REL; Auto Power OFF after 30 minutes of idleness |
| Low battery indication | Battery symbol appears when the battery voltage is low |
| General | |
| Operating temperature | 0°C to 50°C, <70%HR |
| Storage temperature | -20°C to 60°C, <80%HR |
| Max altitude | 2000m |
| Pollution degree | 2 |
| Insulation | Double insulation |
| Power supply | 1x9V battery NEDA 1604 IEC 6F22 |
| Battery life | ca 30 h (backlight ON), ca 130 h (backlight OFF) |
| Mechanical protection | IP40 |
| Size | 138(L) x 68(W) x 37(H) mm |
| Weight (included battery) | 210g |
| Applied standards (LVD) | IEC/EN 61010-1 CAT III 600V |
| Applied standards (EMC) | EN60326 |
Important: Rated CAT III 600 V per IEC/EN 61010-1 with double insulation.
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.
Model No
HT
Condition
Factory New
Manufacturer
HT Instruments
Multi_met_acv
600 V
Multi_met_dcv
600 V
Multi_met_dig
4000 points
Multi_met_type
Digital
30+ Years in Business
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30+ Years in Business
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Sell Test Equipments
Knowledgeable Staff
On-site Lab
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