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AUTOOL BT270 Clamp On Amp Meter DC Clamp Meter
US$76.00
Key Features
- Leakage Checks
- Auto Identify
- Non-Contact Clamp
- Leakage Checks: The meter measures DC leakage, AC leakage, ground leakage, and main line current for broader electrical diagnosis.
- Auto Identify: AC/DC automatic identification and one-touch zeroing reduce manual setup before measurement.
- Non-Contact Clamp: The large clamp is designed for non-contact current measurement, which is more convenient around live wiring.
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AUTOOL BT270
Product Overview
The AUTOOL BT270 is a compact clamp-on amp meter designed for automotive dark current, leakage current, power consumption current, motor startup current, and generator charging current checks. It supports non-contact AC/DC current measurement, automatic AC/DC recognition, one-button zeroing, data hold, and 99-set data storage for quick electrical fault diagnosis.
AC/DC Auto Recognition
0mA-60A AC/DC
1mA Resolution
99 Data Sets
9VDry Battery
≤600VLine Testing
CAT III600V Safety
3 YearsMain Unit Warranty
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Click to enlargeBefore You Order And Use
Before You Order And Use
Review the measurement range, high-voltage caution, zeroing rule, clamp cleanliness, storage environment, battery warning, and maintenance requirements before using the BT270 clamp meter.
Stay Within Range
Do not exceed the specified measurement range of the instrument. The BT270 is designed for 0mA-60A AC/DC current measurement.
Use Caution Above 60V DC / 30V AC
Operate carefully when the line voltage is greater than 60V DC or 30V AC. Use proper electrical safety procedures.
Zero Before Measurement
Before measuring, press the Zero/Backlight button to perform automatic zero adjustment, especially for DC current testing.
Keep The Jaws Clean
Keep the jaw contact surface clean. Serious contamination can affect measurement accuracy even though the meter has strong anti-interference ability.
Avoid Heat, Humidity, And Sunlight
Do not store the clamp meter for a long time in high temperature, high humidity, condensation, non-ventilated areas, or direct sunlight.
Avoid Impact On The Clamp
Avoid impact on the instrument, especially on the jaw joint and contact surface, because damage may affect testing accuracy.
Replace Low Battery Promptly
Low battery can affect test accuracy. Replace the 9V battery when the battery symbol appears, and remove the battery if the meter will not be used for a long time.
Qualified Maintenance Only
Disassembly, calibration, and maintenance should be performed only by qualified professionals or authorized service personnel.
Stop If Safety Is Uncertain
If continued use may create a safety hazard, stop using the meter, isolate it, and contact support or an authorized service provider.
Key Features
Key Features
BT270 focuses on precise current and leakage-current checks with automatic AC/DC recognition, non-contact clamp measurement, one-touch zeroing, backlit display, data storage, and automatic power-off.
Automatic AC/DC Recognition
The meter automatically recognizes AC or DC signals and switches modes without manual mode shifting for common current checks.
0mA-60A Non-Contact Measurement
Measure AC/DC current from 0mA to 60A with 1mA resolution using a clamp-on, non-contact testing method.
Leakage Current Diagnosis
Supports DC leakage current, AC leakage current, ground wire leakage current, and main line current checks.
Backlit LCD Display
The 4-digit LCD screen with backlight helps make current readings easier to see in darker repair environments.
One-Button Zeroing
Press the Zero/Backlight button to reset data to zero before testing. No manual zero-adjustment knob is required.
Data Hold, Memory, And Review
Use the Hold/Mem/Mr button to hold readings and store up to 99 numbered data sets for later review.
Auto Power-Off
After 5 minutes of inactivity, the LCD flashes for 30 seconds before automatic shutdown unless the Power button is pressed to retain the test status.
9V Battery Power
The BT270 runs on a 9V dry battery for portable use around vehicle electrical systems and workshop environments.
Compact Clamp Design
The integrated clamp, trigger, power button, Zero/Light button, Hold/Mem/Mr button, and LCD are arranged in a compact handheld body.
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Click to enlargeApplications
Applications
Use BT270 when you need current-based electrical diagnosis rather than circuit activation or power-probe testing.
Automotive Dark Current
Check vehicle quiescent current after the car is turned off to help identify abnormal battery drain.
Leakage Current
Measure DC leakage current, AC leakage current, and ground wire leakage current during electrical diagnosis.
Main Line Current
Clamp the main wire to check corresponding current without cutting the wire or making direct electrical contact.
Charging And Power Consumption
Measure power consumption current, motor startup current, and generator charging current under proper testing conditions.
How To Use
How To Use
Power on the meter, zero it correctly, clamp the correct wire, read or store the data, and use fuse-by-fuse checking when diagnosing abnormal quiescent current.
Power On
Install a 9V dry battery if needed, then press the Power button to turn the meter on or off.
Zero Before Testing
The meter starts in DC current mode. Press the Zero/Backlight button to zero first, then clamp the wire. For AC current, the meter can auto-zero; for AC current below 25mA, long press the Power button to switch manually.
Clamp The Correct Wire
Clamp positive and negative DC wires for DC leakage current, clamp live and null AC wires for AC leakage current, clamp the ground wire for ground leakage current, or clamp the main wire for corresponding current.
Read, Hold, Or Store Data
Read the current value on the LCD. Press Hold/Mem/Mr to hold and store data automatically; long press Hold/Mem/Mr to review stored data.
Diagnose Quiescent Current
Turn off all appliances and set the key to the off position. If quiescent current is too high, pull fuses one by one. A clear current drop after one fuse is removed indicates the corresponding circuit should be checked.
Use Notes
- The clamp must be fully closed during testing, and the vehicle should be off for quiescent current checks.
- Typical quiescent current may be around 30-40mA after the vehicle is turned off; some European vehicles may be around 80-90mA depending on vehicle class and installed equipment.
- If tested quiescent current is 100mA or above, electrical leakage may exist and the related circuit should be checked.
- If the LCD shows OL, the measured current is over the maximum test range.
- Low battery can affect measurement accuracy. Replace the battery when the low-battery symbol appears.
Specifications
BT270 Product Specifications
BT270 uses non-contact clamp-on measurement with automatic AC/DC shift, 1mA resolution, 99 data sets, CAT III 600V safety classification, and 9V dry battery power.
| Measurement | |
| Product | AUTOOL BT270 Leakage Current Tester Clamp |
| Measurement Method | Non-contact clamp-on measurement |
| Range | 0mA-60A AC/DC |
| Resolution | 1mA AC/DC |
| Accuracy | ±2%rdg ±5dgt (23°C ±5°C, <75%rh) |
| Sampling | 2 times/second |
| Frequency Response | AC: 45Hz-400Hz |
| Shift Mode | Automatic switch |
| Over Range | OL displays |
| Display And Memory | |
| LCD Size | 35 × 21.5mm |
| Backlight | Supported; long press Zero/Light to turn the backlight on or off |
| Data Hold | Press Hold/Mem/Mr to hold data |
| Data Memory | 99 sets |
| Data Review | Long press Hold/Mem/Mr to enter or exit review; use Zero/Light and Hold/Mem/Mr to page up or down |
| Auto Off | LCD flashes after 5 minutes of inactivity; shuts down after 30 seconds if no action is taken |
| Power, Structure And Environment | |
| Power Supply | 9V dry battery |
| Operating Current | Max 20mA |
| Clamp Size | 16 × 18mm |
| Tester Size | 215 × 61 × 32mm |
| Working Temperature | -10°C-50°C |
| Humidity | <80%rh |
| Limiting Temperature Error | -10°C-0°C and 40°C-50°C; max increased error 2%rdg |
| Safety | |
| Line Voltage | 600V or below |
| Insulation | AC 3700V/rms |
| Safety Standard | IEC1010-1 / IEC1010-2-032; Pollution Degree 2; CAT III 600V |
Click to enlargeMeasurement
ProductAUTOOL BT270 Leakage Current Tester Clamp
Measurement MethodNon-contact clamp-on measurement
Range0mA-60A AC/DC
Resolution1mA AC/DC
Accuracy±2%rdg ±5dgt (23°C ±5°C, <75%rh)
Sampling2 times/second
Frequency ResponseAC: 45Hz-400Hz
Shift ModeAutomatic switch
Over RangeOL displays
Display And Memory
LCD Size35 × 21.5mm
BacklightSupported; long press Zero/Light to turn the backlight on or off
Data HoldPress Hold/Mem/Mr to hold data
Data Memory99 sets
Data ReviewLong press Hold/Mem/Mr to enter or exit review; use Zero/Light and Hold/Mem/Mr to page up or down
Auto OffLCD flashes after 5 minutes of inactivity; shuts down after 30 seconds if no action is taken
Power, Structure And Environment
Power Supply9V dry battery
Operating CurrentMax 20mA
Clamp Size16 × 18mm
Tester Size215 × 61 × 32mm
Working Temperature-10°C-50°C
Humidity<80%rh
Limiting Temperature Error-10°C-0°C and 40°C-50°C; max increased error 2%rdg
Safety
Line Voltage600V or below
InsulationAC 3700V/rms
Safety StandardIEC1010-1 / IEC1010-2-032; Pollution Degree 2; CAT III 600V
Product Comparison
Product Comparison
BT270 belongs in the electrical tester family, but it is a leakage-current clamp meter. Compare it with BT160, BT210, BT250, BT260, and BT280 before choosing a current meter or a power-probe style circuit tester.
BT270 FocusChoose BT270 for non-contact AC/DC current measurement, dark current diagnosis, leakage current checks, power consumption current, generator charging current, data hold, and 99-set storage.
Not A Power ProbeBT270 is not intended for polarity testing, continuity testing, jumper lead operation, component activation, relay testing, diode testing, or oscilloscope functions.
Other BT ModelsBT160, BT210, BT250, BT260, and BT280 are more focused on circuit testing, voltage testing, component activation, relay or diode testing, and power-probe functions depending on model.
Display And PowerBT270 uses a 4-digit backlit LCD and 9V dry battery power. Some other models use TFT displays and vehicle battery power through test leads.
Decision CheckChoose BT270 when current measurement is the goal. Choose a power-probe model when you need to energize components, test polarity, check continuity, or diagnose circuits through direct contact testing.
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Click to enlargeWhat Is In The Box
What Is In The Box
The package image shows the BT270 main unit and included accessories. The 9V battery is the required power supply, but it is not clearly shown in the package image, so confirm final package contents before ordering if needed.
Main UnitAUTOOL BT270 leakage current tester clamp
StorageProtective storage pouch shown in the package image
DocumentationAUTOOL BT270 user manual
Retail BoxBT270 product packaging shown in the package image
Battery ReminderBT270 uses a 9V dry battery; confirm whether the battery is included before ordering if required.
Related Products
Related Products
Compare related AUTOOL electrical testers before choosing. BT270 is suitable for current and leakage-current measurement, while the related BT models below focus more on circuit testing or power-probe functions.
- Select options This product has multiple variants. The options may be chosen on the product page
AUTOOL BT210 Car Circuit Tester 9-30V Electrical Testers
From US$28.00 - Select options This product has multiple variants. The options may be chosen on the product page
AUTOOL BT160 Automotive Circuit Tester Circuit Checker
From US$33.00 - Select options This product has multiple variants. The options may be chosen on the product page
AUTOOL BT250 Car Electrical Circuit Tester 6V-30V
From US$39.00 - Select options This product has multiple variants. The options may be chosen on the product page
AUTOOL BT260 Electrical Circuit Tester For Trucks
From US$75.00
Manual And Downloads
Manual And Downloads
Download the BT270 manual for safety notes, zeroing, AC/DC measurement, data memory, leakage-current checking, specifications, maintenance, warranty, and return information.
Click to enlargeAUTOOL BT270 Leakage Current Tester Clamp Manual
Open the PDF manual for BT270 operation, safety, specifications, product care, warranty, and support information.
Download ManualNeed Setup Confirmation?
Contact AUTOOL Store if you need help confirming zeroing, AC/DC current testing, quiescent current checks, package contents, battery requirements, model selection, or warranty details.
Questions And Answers
These answers cover BT270 use cases, AC/DC recognition, measurement range, zeroing, quiescent current diagnosis, power supply, package contents, and warranty support.
BT270 is used for automotive dark current, leakage current, power consumption current, motor startup current, generator charging current, ground wire leakage current, and main line current checks. It is a clamp-on current tester, not a power-probe circuit activation tool.
Yes. BT270 can automatically recognize AC or DC current and switch modes without manual mode shifting for common testing. For AC current below 25mA, long press the Power button to switch manually.
The BT270 measuring range is 0mA-60A AC/DC with 1mA AC/DC resolution. If the LCD shows OL, the measured current is over the maximum test range.
Yes. Press the Zero/Backlight button before measurement to perform automatic zero adjustment. The meter starts in DC current mode after power-on. For AC measurement, the meter can auto-zero, but zeroing before general testing is still a safe operating habit.
Yes. Turn off all vehicle appliances, turn the key off, and make sure the clamp is fully closed during testing. Typical quiescent current may be about 30-40mA, while some European vehicles may be about 80-90mA depending on vehicle class and installed equipment.
If tested quiescent current is 100mA or above, electrical leakage may exist. Open the fuse box and pull fuses one by one. If the current drops clearly after one fuse is removed, check the corresponding circuit or appliance, repair the issue, and test again.
No. BT270 is mainly for clamp-on current measurement and leakage-current diagnosis. If you need polarity testing, continuity testing, jumper lead operation, component activation, relay testing, diode testing, or power-probe functions, compare BT160, BT210, BT250, BT260, and BT280 before ordering.
BT270 uses a 9V dry battery. Replace the battery promptly when the low-battery symbol appears, because low battery can affect measurement accuracy. Remove the battery if the meter will not be used for a long time.
The package image shows the BT270 main unit, storage pouch, user manual, and retail box. BT270 requires a 9V dry battery, but the battery is not clearly shown in the packing image, so confirm final package contents with support if needed.
AUTOOL provides a three-year warranty for the main unit from the date of receipt, and included accessories are covered by a one-year warranty. Warranty handling depends on the actual breakdown condition and the store policy.
Warranty And Contact
Warranty And Contact
For BT270 measurement setup, AC/DC recognition, zeroing, quiescent current diagnosis, package confirmation, battery questions, comparison with other BT electrical testers, or warranty support, contact AUTOOL Store directly.
Pre-Sales And Product Support
Use support if you need help confirming whether BT270 is the right choice for current measurement or whether another AUTOOL BT circuit tester is better for voltage testing, power-probe functions, relay testing, diode testing, or component activation.
- BT270 setup, zeroing, and AC/DC current measurement support
- Dark current and leakage-current diagnosis guidance
- Package contents and 9V battery requirement confirmation
- Comparison with BT160 / BT210 / BT250 / BT260 / BT280
- Main unit warranty and accessory warranty support
- Troubleshooting, maintenance, and after-sales assistance
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