The Megger DCM320 is an ideal clamp meter for use during the installation, maintenance and checking of electrical systems and equipment.
The DCM 320 clamp meter will measure AC current (50 – 60 Hz) up to 400 A, with a Data-hold feature to freeze the displayed value for use in confined situations where the display may be difficult to read. The DCM320 has the benefit of measurement ranges for a.c. and d.c. voltages up to 600 V, and resistance up to 20 MΩ, via the terminals and supplied test leads. It also has a continuity buzzer that operates up to 20 Ω.
The Megger DCM320 clamp meter is safety rated to IEC 61010 CAT III 600 V, so offering high levels of protection to the operator. A carrying case is included, and even without the case, this current clamp meter is rated to withstand a 1.2 m drop onto a hard surface without damage. The compact clamp jaw enables cables to be measured as large as 27 mm diameter, so covering the majority of applications within the electrical system installation industry. Ideal for use by anyone working on basic electrical systems or equipment, these instruments are also suitable for the majority of applications encountered by the electrical contractor.
Key Features:
600 V AC/DC measurement range
Resistance up to 20 MΩ
Robust, compact and lightweight
Extensive battery life
Auto power off functionality
Freeze frame data hold functionality
Max hold store and display
2000 digit large scale readout
Compact clamp jaw measures up to 27mm diameter cables
12-month warranty
Megger Part Number – 1000-304
Specifications
Attribute
Value
Absolute Maximum AC Current Measurement
400A ac
Absolute Maximum AC Voltage Measurement
600V ac
Absolute Maximum DC Voltage Measurement
600V dc
Absolute Maximum Resistance Measurement
20MΩ
Model Number
DCM320
Calibrated
RSCAL
Clamp Meter Type
AC Current Clamp Meter
Best AC Current Accuracy
±1.9% ±5 Digits
Best AC Voltage Accuracy
±1.5% ±5 Digits
Best DC Voltage Accuracy
±1% ±2 Digits
Functions Measured
AC Current
Absolute Maximum Temperature Measurement
+50°C
Power Source
Battery
Maximum Operating Temperature
+50°C
Best Temperature Measurement Accuracy
>80 %
Safety Category
CAT III 600 V
Best Resistance Measurement Accuracy
±1.9% ±5 Digits
Dimensions
56 x 28 x 188mm
Battery Type
1.5 A Alkaline
Safety Category Voltage
600V
Safety Category Level
CAT III
Weight
225g
Battery Life
200 h
Maximum Conductor Size
27mm
Length
56mm
Width
28mm
Display Type
LCD
Minimum Operating Temperature
0°C
Height
188mm
Megger DCM320 Digital Clamp Meter
Battery
Pouch
User Guide
🚚 Testersmans Shipping Policy
Free Mainland GB Delivery Over £150
We offer free delivery on most mainland Great Britain orders over £150 (ex VAT).
This applies across England, Wales, and most of Scotland, excluding certain remote or offshore postcodes.
If your order total falls just short of £150, or you’re a returning customer, feel free to contact us — we may be able to offer a discount code or delivery workaround.
📞 01945 738112 | ✉️ [email protected]
📦 UK Delivery Options
We work with both Royal Mail and DHL to offer reliable and flexible delivery across the UK:
Royal Mail – Best suited for lighter parcels and for customers in remote regions, including the Highlands, Islands, and Northern Ireland.
DHL – Ideal for most mainland UK orders, providing fast, tracked delivery and excellent reliability for time-sensitive shipments.
Our checkout system automatically displays the available delivery services for your postcode and order weight, ensuring you always see the most suitable options.
Note: Heavy, bulky, or freight-only orders will be charged separately.
Our website is designed for quick, transactional purchases rather than bulk or palletised orders.
Please contact us in advance for a tailored freight quotation if your order falls into this category.
⏱ Dispatch & Delivery Timing
We aim to dispatch all in-stock orders promptly, but delivery depends on both when you order and which service you select.
UK orders: placed by 2:00 PM Monday–Friday are usually dispatched the same day.
International orders: placed by 2:00 PM Monday–Thursday are usually dispatched the same day.
Orders placed after these times are processed the next working day. This means delivery may occur the following day or later, depending on the courier and service selected.
Once dispatched, your chosen delivery service determines how quickly your parcel arrives:
Standard services We use Royal Mail Tracked 24 or DHL Parcel as our ‘Standard’ services. They are not guaranteed to arrive next working day.
Premium services (e.g. Royal Mail Special Delivery or DHL by Noon) offer guaranteed delivery windows.
If your order is time-sensitive, we strongly recommend choosing a guaranteed service or contacting us before ordering to confirm availability.
Please note: For logistical reasons, we may occasionally adjust the delivery method selected at checkout. For example, smaller items may be better suited to letterbox-friendly packaging or may be at greater risk of delay or loss via certain services. We actively monitor courier and postal service disruptions—including strikes and delays—and may modify shipping arrangements to help ensure timely and secure delivery.
📅 Busy Periods & Delays
We always aim to dispatch promptly, but delivery times may be affected by:
Seasonal demand (e.g. Christmas, bank holidays, or industry shutdowns)
Courier network delays outside our control
Supplier lead times or calibration requirements for certain equipment
If your delivery is time-critical, please contact us before ordering so we can confirm stock and courier availability.
🌍 International Shipping
We ship worldwide using UPS Express Saver® and other trusted global courier partners. All international shipments are tracked and generally dispatched Monday to Thursday to ensure smooth customs clearance and transit.
Estimated delivery times:
Europe: 1–2 working days
North America: 2–3 working days
Asia-Pacific & Rest of World: 3–5 working days
Delivery times vary depending on location, customs clearance, and local courier performance.
💰 Taxes, Customs & Import Duties
International customers are responsible for any applicable taxes, customs charges, or import duties.
These are not included in our product or shipping prices.
Your courier will typically provide a secure payment link for any import charges once your parcel reaches customs.
If import fees are refused and the parcel is returned, we will issue a refund minus all incurred shipping and return costs.
📍 Using Your Own Courier
If you would prefer to arrange collection via your own courier (UK or international), please contact us before placing your order to coordinate collection from our Wisbech warehouse.
📝 Important Notes
Please ensure your delivery address and contact number are correct at checkout.
Undelivered parcels may be returned to us after a short holding period.
Redelivery or return fees may apply, even if your order originally qualified for free delivery.
By placing an order, you confirm your understanding and acceptance of this policy.
Select options
This product has multiple variants. The options may be chosen on the product page
Cookie Preferences
We use cookies to keep our website running smoothly, improve your experience, and help us understand how people use our site. You can accept all cookies, reject non-essential cookies, or choose your preferences below.
Functional
Always active
These cookies are essential for the website to function properly and cannot be switched off.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
These cookies help us understand how visitors use our website so we can improve it over time.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
These cookies may be used to show relevant adverts and measure the effectiveness of our marketing activities.
To provide the best experiences, we use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us to process data such as browsing behaviour or unique IDs on this site. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Functional
Always active
These cookies are essential for the website to function properly and cannot be switched off.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
These cookies help us understand how visitors use our website so we can improve it over time.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
These cookies may be used to show relevant adverts and measure the effectiveness of our marketing activities.