# HT Instruments HT211 TRMS Digital Multimeter # HT Instruments HT211 TRMS Digital Multimeter ## Key Features At A Glance - Measurement category CAT III 600V to ground, with double insulation and IP40 mechanical protection - True-RMS (TRMS) conversion for AC voltage and AC current measurement - 3 ¾ digit, 4000-point LCD with backlight, automatic polarity, and "OL" overrange indication - Measures DC/AC voltage and current, resistance, continuity, diode, frequency, duty cycle, and capacitance - Type K thermocouple temperature measurement from -20.0°C to 760.0°C - Data HOLD and MAX/MIN functions with 2 samples/s sampling rate - Powered by a single 9V battery (NEDA 1604 / IEC 6F22) with auto power off after 15 minutes idle - Fused inputs: fast 10A/600V and fast 500mA/600V (5x20mm) The HT211 from HT Instruments is a TRMS digital multimeter built around a 3 ¾ digit, 4000-point LCD with backlight. It uses true-RMS conversion and provides automatic polarity indication, an "OL" overrange indication, and a low-battery indicator, sampling at 2 times per second. A digital multimeter is a general-purpose bench and field instrument for measuring electrical quantities such as voltage, current, and resistance. The HT211 covers DC and AC TRMS voltage, DC and AC TRMS current, resistance and continuity, diode test, frequency, duty cycle, capacitance, and temperature with a Type K probe, consolidating these functions in a single handheld unit. ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. ## Product Core & Specifications Specification Value DC Voltage (Input impedance 10MΩ, Overload protection 600VDC/ACrms) 400.0 mV range (resolution 0.1 mV) ±(2.0%rdg + 8dgt) 4.000 V range (resolution 0.001 V) ±(2.0%rdg + 3dgt) 40.00 V range (resolution 0.01 V) ±(2.0%rdg + 3dgt) 400.0 V range (resolution 0.1 V) ±(2.0%rdg + 3dgt) 600 V range (resolution 1 V) ±(1.2%rdg + 3dgt) AC TRMS Voltage (50Hz ÷ 400Hz, Input impedance 10MΩ, Overload protection 600VDC/ACrms) 4.000 V range (resolution 0.001 V) ±(2.0%rdg + 5dgt) 40.00 V range (resolution 0.01 V) ±(1.5%rdg + 3dgt) 400.0 V range (resolution 0.1 V) ±(1.5%rdg + 3dgt) 600 V range (resolution 1 V) ±(2.0%rdg + 4dgt) DC Current 400.0 µA range (resolution 0.1 µA) — Overload protection: Fast fuse 500mA/600V ±(1.5%rdg + 3dgt) 4000 µA range (resolution 1 µA) ±(1.5%rdg + 3dgt) 40.00 mA range (resolution 0.01 mA) ±(1.5%rdg + 3dgt) 400.0 mA range (resolution 0.1 mA) ±(1.5%rdg + 3dgt) 4.000 A range (resolution 0.001 A) — Overload protection: Fast fuse 10A/600V ±(2.5%rdg + 5dgt) 10.00 A range (resolution 0.01 A) ±(2.5%rdg + 5dgt) AC TRMS Current (50Hz ÷ 400Hz) 400.0 µA range (resolution 0.1 µA) — Overload protection: Fast fuse 500mA/600V ±(2.0%rdg + 5dgt) 4000 µA range (resolution 1 µA) ±(2.5%rdg + 5dgt) 40.00 mA range (resolution 0.01 mA) ±(2.5%rdg + 5dgt) 400.0 mA range (resolution 0.1 mA) ±(2.5%rdg + 5dgt) 4.000 A range (resolution 0.001 A) — Overload protection: Fast fuse 10A/600V ±(3.0%rdg + 7dgt) 10.00 A range (resolution 0.01 A) ±(3.0%rdg + 7dgt) AC accuracy note Accuracy referred to sinusoidal waveform. For not sinusoidal waveforms the accuracy is ±(10.0%rdg + 5dgt) Resistance and Continuity Test (Buzzer <50Ω, Overload protection 250VDC/ACrms) 400.0 Ω range (resolution 0.1 Ω) ±(1.0%rdg + 4dgt) 4.000 kΩ range (resolution 0.001 kΩ) ±(1.5%rdg + 5dgt) 40.00 kΩ range (resolution 0.01 kΩ) ±(1.5%rdg + 5dgt) 400.0 kΩ range (resolution 0.1 kΩ) ±(1.5%rdg + 5dgt) 4.000 MΩ range (resolution 0.001 MΩ) ±(1.5%rdg + 5dgt) 40.00 MΩ range (resolution 0.01 MΩ) ±(1.5%rdg + 5dgt) Diode Test Max open voltage 3VDC (Overload protection 250VDC/ACrms) Frequency (Sensitivity >8Vrms, Overload protection 250VDC/ACrms) 9.999 Hz range (resolution 0.001 Hz) ±(1.5%rdg + 5dgt) 99.99 Hz range (resolution 0.01 Hz) ±(1.5%rdg + 5dgt) 999.9 Hz range (resolution 0.1 Hz) ±(1.2%rdg + 3dgt) 9.999 kHz range (resolution 0.001 kHz) ±(1.2%rdg + 3dgt) Duty Cycle (Sensitivity >8Vrms, Overload protection 250VDC/ACrms) 0.1 – 99.9% range (resolution 0.1%) ±(1.2%rdg + 2dgt); 100µs < impulse duration < 100ms; Frequency range: 5Hz ÷ 150Hz Capacitance (Overload protection 250VDC/ACrms) 40.00 nF range (resolution 0.01 nF) ±(5.0%rdg + 35dgt) 400.0 nF range (resolution 0.1 nF) ±(3.0%rdg + 5dgt) 4.000 µF range (resolution 0.001 µF) ±(3.0%rdg + 5dgt) 40.00 µF range (resolution 0.01 µF) ±(3.0%rdg + 5dgt) 400.0 µF range (resolution 0.1 µF) ±(4.0%rdg + 5dgt) 4000 µF range (resolution 1 µF) ±(5.0%rdg + 5dgt) Temperature with Type K Probe (Overload protection 250VDC/ACrms) \-20.0°C ÷ 760.0°C (resolution 0.1°C) ±(3.0%rdg + 5°C) — accuracy of only instrument without probe \-4.0°F ÷ 1400.0°F (resolution 0.1°F) ±(3.0%rdg + 9°F) — accuracy of only instrument without probe General Specifications Display LCD, 3 ¾ dgt, 4000 points plus sign and decimal point Sampling rate 2 times/s Conversion TRMS Polarity Automatic polarity indication Backlight Yes Overrange indication “OL” Features Data HOLD, MAX/MIN Low battery indication Symbol appears when the battery voltage is low Operating temperature 5°C to 50°C, <80%RH Storage temperature \-20°C to 60°C, <80%RH Max height of use 2000m Pollution degree 2 Insulation Double insulation Mechanical protection IP40 Power supply 1x9V battery NEDA 1604 IEC 6F22 Auto Power OFF After 15 min of idleness Protection fuses fast 10A/600V, 5x20mm (10A input); fast 500mA/600V, 5x20mm (mA/µA input) Dimensions (L x W x H) 145 x 70 x 60mm Weight (included battery) 240g Safety IEC/EN61010-1 EMC IEC/EN61326-1 Measurement category CAT III 600V to ground Conformity European directive on low voltage 2014/35/EU, EMC directive 2014/30/EU, RoHS 2011/65/EU, WEEE 2012/19/EU > **Important:** Measurement category: CAT III 600V to ground. > **Important:** Temperature measurement requires a Type K probe; the stated temperature accuracy is that of the instrument only, without the probe. > **Important:** AC current accuracy is referred to a sinusoidal waveform. For not sinusoidal waveforms the accuracy is ±(10.0%rdg + 5dgt). ## 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:** 109.0 USD - **Vendor:** HT Instruments - **Type:** Multi Met - **Tags:** HT Instruments, Manufacturers, Meters & DAQ, Multimeter, product_manual_group_3, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 109.00 USD | In stock | ## Images - HT Instruments HT211 TRMS Digital Multimeter --- > Source: [ValueTronics](https://valuetronics.com/products/ht211-ht-instruments-multimeter-new) > Updated: 2026-06-20