HIOKI DIGITAL MULTIMETER DT4221-20, Premier Pocket DMM with CAT IV 300 V, CAT III 600 V Safety
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Product Description
The DT4221 is a pocket-sized digital multimeter designed specifically for electrical work requiring optimal safety, with ±0.5% DC V accuracy and wide 40 Hz to 1 kHz AC V bandwidth.
- Achieving a high level of safety in a compact body and lightweight design
- Resistance and diode testing functions omitted by design in pursuit of added safety (DT4221)
- Voltage detection function (DT4221)
- Robust design capable of withstanding a drop from a height of 1 m
- ±0.5% DC V basic accuracy, wide 40 Hz to 1 kHz AC V frequency characteristics
- Low-pass filter cuts high harmonics (when measuring inverter fundamental waveforms)
- Broad -10°C to 50°C (14°F to 122°F) operating temperature range

Basic specifications
- DC Voltage range: 600.0 mV to 600.0 V, 4 ranges, Basic accuracy: ±0.5 % rdg. ±5 dgt.
- AC Voltage range: 6.000 V to 600.0 V, 3 ranges, Frequency characteristics: 40 Hz - 1 kHz
- Basic accuracy: 40 - 500 Hz : ±1.0 % rdg. ±3 dgt. (True RMS, crest factor 3)
- Resistance range: N/A
- Capacitance range: N/A
- Frequency range: AC V measurement: 99.99 Hz (5 Hz or more) to 9.999 kHz, 3 ranges / Basic accuracy: ±0.1 % rdg. ±2 dgt.
- Continuity check: Continuity threshold [ON]: 25 Ω or less (buzzer sound), [OFF]: 245 Ω or more Response time: 0.5 ms or more
- Diode test: N/A
- Voltage detection: 80 V to 600 V AC
- Other functions: Filter function, display value hold, relative value display, auto-power save
- Display: Main and Sub displays: 4-digits LCD, max. 6000 digits, bar graph
- Display refresh rates: 5 times/s (Capacitance measurement: 0.05 to 5 times/s, depending on measured value, Frequency: 1 to 2 time/s )
- Power supply: LR03 alkaline batteries ×1, Continuous use: 40 hours (backlight OFF)
- Dimensions and mass: 72 mm (2.83 in)W × 149 mm (5.87 in)H× 38 mm (1.50 in)D,190 g (6.7 oz) (including batteries and holster)
- Included accessories: Test lead DT4911 ×1, Holster ×1, Instruction manual ×1, LR03 alkaline battery ×1
Global Shipping
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All orders are shipped from our Central Logistics Hub, currently operated in South Korea, where ROAExpo directly performs free pre-shipment QQ Inspection (Quality & Quantity Inspection). Additional regional logistics hubs will be expanded globally in the future.
Available Shipping Methods
- Sea Parcel – Most economical option for heavy or bulk orders
- Air Parcel – Balanced option between cost and delivery speed
- EMS – International postal delivery service
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- UPS – Premium international courier service
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You can combine products from multiple brands or stores in one cart to reach the USD $150 purchase threshold and receive shipping discounts, as long as the products are shipped from the same origin country.
The Final Shipping Cost Before Payment is clearly displayed at checkout. There are No Hidden Fees after payment confirmation.
Shipping Discount Benefits – Global Free Shipping (GFS)
- Orders over USD $150 with total shipping weight under 3kg may qualify for Free Shipping
- If total shipping weight exceeds 3kg, customers may receive up to USD $30 Shipping Discount
- The GFS Coupon (Code: ENJOYGFS-KOR) is automatically issued to eligible members and can be found in the member’s account after login. There is no limit on the number of uses.
- The GFS coupon may be combined with other promotions or coupons
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Once shipped, a Tracking Number will be provided to the customer.
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Import duties, taxes, and customs fees may be charged by the destination country and are the responsibility of the customer unless otherwise stated.
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All products sold on ROAExpo are Authentic Products sourced directly from Official Suppliers or manufacturers.
Returns Due to Defect or Shipping Error
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ROAExpo will review the case and provide appropriate resolution, including replacement or refund when applicable.
Returns for Change of Mind
Due to international shipping and customs regulations, returns for personal reasons may be restricted.
In such cases, the customer may be responsible for all return shipping costs and any applicable customs charges.
Please contact Customer Support before initiating any return shipment.
Refund Processing
Refunds are processed after the returned item is received and inspected, or after the claim is verified.
Refund processing time may vary depending on payment method and financial institutions.
Non-Returnable Items
Certain products may not be eligible for return due to hygiene, safety, or manufacturer restrictions.
Customer Support
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