can I extend length of ct connection by >5 metres

I extended the ct connection by 2 metres using a heavier gauge wire to reduce resistive loss. No change in measurement from monitoring the same power load in my application but technically due to the low currents involved it may be more prone to stray 50Hz noise pickup so the effect on accuracy cannot be guaranteed for all applications.

What is the largest diameter cable it can monitor?

Approximately 13mm. Since a single conductor of such dimensions would be very inflexible and have a current carrying capacity far in excess of the products rated capacity the use of such a large cable would be impractical. Use of a 7 sq mm conductor would be the likely maximum in a domestic application.

Can this be clipped onto a 3-core cable? (live, neutral, earth)

You cannot measure the current without separating the wires. I did this by slitting the three core cable so that I could pull the live wire out enough to put the clamp around it

does this device record cumulative energy...I want to measure how much energy my sauna uses over 10 hours - can it record that?

Yes, used it just the same to measure a panel heater kWhr consumption

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DollaTek AC 80-260V 100A Current Voltage Ampere Power Energy Panel Meter LCD Digital Display Ammeter Voltmeter Multimeter with Open CT

Product ID: 344357756

Details

Brand
DollaTek
Power source
Corded
Style
Active
Colour
Blue
Item weight
160 Grams

⚡0.5W starting power detection

📊180° wide-view LCD display

🔋0~999kWh energy range

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$44.47

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your precision — measure smarter, not harder!

SMART OVERLOAD ALARM - Instant flashing backlight & power alert when preset limits are exceeded—never miss a critical spike.
SEAMLESS DATA SECURITY - Automatic data storage protects your readings even during sudden power outages.
EFFORTLESS ONE TOUCH CONTROL - Quickly reset energy, toggle backlight, and set alarms with a single button press.
ALL IN ONE PRECISION METERING - Simultaneously track voltage, current, power, frequency & power factor for total control.
CRYSTAL CLEAR 180 LCD DISPLAY - Large blue-backlit screen ensures perfect visibility from any angle, day or night.

The DollaTek AC 80-260V 100A Digital Panel Meter is a versatile multimeter designed for professional-grade electrical monitoring. It measures voltage, current, active power, energy, frequency, and power factor simultaneously, featuring a large 180° view LCD with blue backlight. Equipped with a split current transformer for easy installation, it offers a customizable overload alarm and automatic data retention during power loss, making it an indispensable tool for precise energy management.

Specifications

Manufacturer	DollaTek
Part number	ELA16152
Item Weight	160 g
Package Dimensions	18.4 x 13.9 x 3.6 cm; 160 g
Item model number	B092VYQ697
Colour	Blue
Style	Active,One-touch
Power source type	Corded Electric
Item Package Quantity	1
Specification met	CE
Batteries included?	No
Batteries Required?	No

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