Product Overview
The BSIDE Rechargeable Voltage Tester Pen is a versatile and essential tool for electricians, maintenance crews, and safety personnel. This multi-function electrical tester pen offers both contact and non-contact AC voltage detection, live/neutral wire distinction, and breakpoint location. Its color LCD display ensures clear readings in various environments, and the built-in rechargeable battery provides convenience and reliability.

Image: The BSIDE Rechargeable Voltage Tester Pen, shown alongside its USB charging cable. This image highlights the compact design and the included charging accessory.
Package Contents
Upon opening the package, please verify that all items listed below are present and in good condition:
- 1 x BSIDE AC Voltage Tester Pen
- 1 x USB Charging Cable
- 1 x User Manual

Image: A clear view of the BSIDE Voltage Tester, its charging cable, and the included user manual, demonstrating the complete package contents.
Setup
The BSIDE Voltage Tester Pen features a built-in rechargeable battery. Before first use, or if the battery is low, it is recommended to fully charge the device.
Charging the Device
- Locate the charging port on the device.
- Connect the provided USB charging cable to the tester.
- Plug the other end of the USB cable into a standard USB power adapter (not included) or a computer USB port.
- The charging indicator light will illuminate during charging and turn off when fully charged.

Image: The BSIDE Voltage Tester Pen being charged via its USB cable, connected to a laptop. This illustrates the rechargeable nature of the device.
Operating Instructions
The BSIDE Voltage Tester Pen offers multiple functionalities for electrical testing. Always ensure proper safety precautions are followed when working with electrical circuits.
1. Power On/Off and Flashlight
- To power on the device, press and hold the power button.
- To power off, press and hold the power button again.
- To activate the built-in flashlight, short press the flashlight button. Short press again to turn it off.

Image: The BSIDE Voltage Tester Pen's bright LED flashlight in use, illuminating electrical components in a dimly lit area, demonstrating its utility in dark environments.
2. Non-Contact Voltage (NCV) Detection (V-Alert)
This mode allows for quick and safe detection of AC voltage without direct contact with the conductor.
- Ensure the device is powered on.
- Bring the tip of the tester close to the wire, outlet, or electrical component you wish to test.
- If AC voltage is detected, the device will emit audible beeps and the LED indicator will flash, with the intensity of the beeps and flashes increasing with stronger voltage. The color LCD will also display a signal strength bar.

Image: The BSIDE Voltage Tester Pen detecting voltage non-contactually near a terminal block, with the LCD showing the V-Alert signal strength.
3. Contacted AC Voltage Measurement
For more precise AC voltage readings, the device can be used in contacted mode.
- Ensure the device is powered on.
- Carefully touch the test probe of the tester directly to the conductor with AC voltage.
- The AC voltage reading will be displayed on the color LCD screen. For optimal accuracy, it is recommended to avoid wearing gloves during this measurement.

Image: The BSIDE Voltage Tester Pen in action, performing a direct contact voltage test on an electrical terminal, with the measured voltage clearly visible on the LCD.
4. Live/Neutral Wire Distinction
The tester can differentiate between live and neutral wires in contacted mode.
- Touch the test probe to the conductor.
- If it detects a live wire, the device will show a backlight and emit alarm beeps.
- If it detects a neutral wire, there will be no signal or alarm.

Image: A side-by-side comparison showing the BSIDE Voltage Tester Pen indicating a live wire with an alarm and backlight, versus no signal for a neutral wire.
5. Breakpoint Location
This feature helps in locating breaks in live wires.
- Move the tester along the length of the live wire.
- The device will indicate the presence of voltage up to the point of the break.
- The signal will cease or significantly weaken past the breakpoint, helping to pinpoint the exact location.

Image: An illustration demonstrating the breakpoint location feature, with one tester indicating voltage before a break in a wire and another showing no signal past the break.
6. Environment Temperature Measurement
The AC voltage tester can also function as a temperature sensor, expanding its utility.
- Refer to the device's display for the current ambient temperature reading.

Image: The BSIDE Voltage Tester Pen showing an environmental temperature reading on its color LCD, highlighting its additional sensor capability.
Maintenance
Proper maintenance ensures the longevity and accuracy of your BSIDE Voltage Tester Pen.
- Cleaning: Wipe the device with a dry, soft cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the tester in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: As the device has a built-in rechargeable battery, avoid fully discharging it for extended periods. Charge it regularly, even if not in frequent use, to maintain battery health.
- Calibration: This device is factory calibrated. If you suspect inaccuracies, contact customer support. Do not attempt to self-calibrate.
Troubleshooting
If you encounter issues with your BSIDE Voltage Tester Pen, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or depleted battery. | Charge the device using the provided USB cable. |
| Inaccurate voltage readings. | Interference from nearby electrical fields; improper contact in contacted mode. | Ensure no other strong electrical fields are nearby. For contacted mode, ensure firm and direct contact with the conductor. Avoid wearing gloves for contacted measurements. |
| No signal in NCV mode. | Voltage is too low or absent; device not close enough to the source. | Verify the presence of voltage with a known live source. Bring the tester tip closer to the conductor. |
| Flashlight not working. | Flashlight function not activated; low battery. | Short press the flashlight button. Charge the device if battery is low. |
If the problem persists after trying these solutions, please contact BSIDE customer support for further assistance.
Specifications
| Parameter | Value |
|---|---|
| Model | S4X AC Voltage Tester Signle Pole |
| Display | Color LCD |
| AC Voltage Range | 12-300V (Accuracy: 1V ±5%) |
| Environmental Temperature Range | 0-50°C (Accuracy: ±2.0°C) |
| Power Source | Built-in 3.7V rechargeable battery |
| Dimensions (L x W x H) | 166 x 28 x 23 mm (6.54 x 1.1 x 0.91 inches) |
| Weight | 84g (2.96 ounces) |
| Manufacturer | BSIDE |
Warranty and Support
For warranty information or technical support, please refer to the official BSIDE website or contact their customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.
For the most up-to-date support information, visit: www.bside.com