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You can use this device from 3.5-7VDC input voltage (although most USB  devices tend to hover around 4.75 to 5.25) and up to 3A of current. It  flips between voltage and current readouts every 3 seconds or so. It's a  very handy tool for testing USB devices, checking load levels and  debugging battery chargers and boost converters.

• USB 1.x and 2.x - all data speeds. Does not have USB v3 pins so USB v3 connections will automatically downgrade to v2
• Working Range: 0~3A, 3.5~7VDC
• Resolution: 10mV / 10mA
• Operating Temperature: 0-60ºC
• Contents:
• Camera Board 360 Gooseneck Mount V2

Dimensions:

• 21mm x 53mm x 15mm / 0.8" x 2.1" x 0.6"
• USB Plug: 13mm / 0.5"
• Weight: 16.2g

Use the USB Charger Doctor to measure the working voltage and current output for any USB port and project. This plastic dongle plugs between a USB device, and passes the data lines through. There's a 0.05 ohm resistor in line with the power pin that is used to measure current draw. The Doctor's digital display instantly reads the numbers out for testing devices such as chargers, cables, and cell phones.

You can use this device from 3.5-7VDC input voltage (although most USB devices tend to hover around 4.75 to 5.25) and up to 3A of current. It displays both voltage and current readouts. It's a very handy tool for testing USB devices, checking load levels and debugging battery chargers and boost converters.

Specifications:

Voltage range: 3.3V-9V
Current range: 0-3A
Voltage display: red
Current display: blue
Out put : 2 USB
Size: 52mm x 34mm x12mm
Weight: 16g
Shell color: Dark black

What's in the box?:

1 x Voltage Tester Dual USB

• Auto Range. 
• True RMS measurement. 
• Resistance capacitance frequency file high voltage 550V protection. 
• Large screen display, the maximum of 6000 words. 
• Sampling rate: about 3 times per second.
• Temperature measuring.
• Backlight display. 
• Data retention. 
• Polarity automatic recognition. 
• Low voltage display. 
• 10A large current measurement MA level small current measurement Automatic shutdown. 
• Main measurement: AC / DC voltage, AC / DC current, resistance, capacitance. 
• Diode / off measurement, frequency and duty ratio measurement. 

RPICT3T1

Please note: Raspberry Pi and sensors are NOT INCLUDED

Online Documentation

• 3x AC Current Ports.
• 1x Temperature Ports.
• Provides Irms, EstimatedPower, Temperature.
• View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
• Configurable from serial port.
• Open Source Arduino Firmware.

• 1 RPICT3T1 Unit.
• 2 Mounting Stand off with screws.

• DS18B20

• SCT-013-000 (0A to 30A)

This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

• 7x AC Current Ports.
• 1x AC Voltage Ports.
• Provides Irms, Vrms, RealP, ApparentP, ReactiveP, PFactor, Frequency, EstimatedP.
• View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
• Configurable from serial port.
• Open Source Arduino Firmware.
• Stackable with RPICT8 Slave.

• 1 RPICT7V1 Unit.
• 4 Mounting Stand off with screws.

• 77DE-06-09 (EU)

• SCT-013-000 (100A)

This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

RPICT3T1

Please note: Raspberry Pi and sensors are NOT INCLUDED

• 3x AC Current Ports.
• 1x Temperature Ports.
• Provides Irms, EstimatedPower, Temperature.
• View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
• Configurable from serial port.
• Open Source Arduino Firmware.

• 1 RPICT3T1 Unit.
• 2 Mounting Stand off with screws.

• DS18B20

• SCT-013-000 (0A to 100A)

This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

• 7x AC Current Ports.
• 1x AC Voltage Ports.
• Provides Irms, Vrms, RealP, ApparentP, ReactiveP, PFactor, Frequency, EstimatedP.
• View/record data using Linux / Python / Emoncms / Grafana / MQTT and more.
• Configurable from serial port.
• Open Source Arduino Firmware.
• Stackable with RPICT8 Slave.

• 1 RPICT7V1 Unit.
• 4 Mounting Stand off with screws.

• 77DE-06-09 (EU)

• SCT-013-000 (100A)

This development board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by LeChacal.com to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This
evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

The RPIZ_CT3T1 is the same unit as the RPICT3T1 in the Raspberry pi Zero format.

Refer to the RPICT3T1 for full documentation.

Use with sct-013-000 split core current sensor and DS18B20 temp sensor

Please note: Raspberry Pi Zero and sensors are not included

The RPIZ_CT3T1 is the same unit as the RPICT3V1 in the Raspberry pi Zero format.

Refer to the RPICT3V1 for full documentation.

Use with sct-013-000 split core current sensor and 230VAC to 9VAC power adapter

Please note: Raspberry Pi Zero and sensors are not included

• current detection
• over current protection (can be preset from 0.5A to 35.0A)

Interface

1. When the current flows in from positive direction: V0=Vcc*0.5+la*K, V0=(2.5+0.06)V=2.56V
2. When the current flows in from negative direction: V0=Vcc*0.5-la*K, V0=(2.5-0.06)V=2.44V
3. If it is an AC signal: V0=Vcc*0.5+la*K, V0=(2.5+0.06)V=2.56V

1. Make sure the current flows in from the positive direction. Adjust to the desired current warning level.
2. LED will be on when current is below the setting and DOUT will be low.
3. When the detected current is higher than your setting, the LED will turn off and the DOUT pin will go high.

• Calibration programmable registers can directly read its unit of measure is the ampere current, and power in watts per read.
• For as many as 128 sampling averaging, in order to realize filter in noise environment.
• The I2C interface has a timeout, not only can avoid the bus lock, but also can provide high-speed mode, meet the communication requirements of up to 3.4 MHz.
• All features are support software programmable INA219.
• Using single power supply, the working voltage between 3.0 to 5.5 V. 

This is a 4-ch current and power monitor HAT designed for Raspberry Pi. Via the I2C or SMBus interface, it is easy to monitor each channel's current, voltage, and power consumption, as well as the voltage between both sides of the sampling resistor.

• Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
• 4-ch monitoring, via I2C/SMBus interface
• Onboard 0.1Ω 1％ sampling resistor, allows measuring bi-directional current up to 3.2A
• Embedded 12-bit ADC, supports multiple successive converting, 0~26V voltage measuring range
• Directly calculate and output measured power value through additional multiply register
• I2C control pins for connecting with other host boards
• Comes with development resources and manual (examples for Raspberry Pi/Arduino/STM32)

• Operating voltage: 3.3V/5V
• Control interface: I2C/SMBus
• Sampling resistor: 0.1Ω 1%
• Voltage range: 0~26V
• Current range: ±3.2A
• Resolution: 0.8mA (±3.2A range) OR 0.1mA (±400mA range)
• Dimensions: 65mm × 30mm
• Mounting hole size: 3.0mm

Dimensions

Wiki : www.waveshare.com/wiki/Current/Power_Monitor_HAT

• Designed for Raspberry Pi series, compatible with Raspberry Pi 3 / 3B / 4B, etc.
• I2C bus communication, monitoring the batteries voltage, current, power, and remaining capacity in real time
• Multi battery protection circuits: over charge/discharge protection, over current protection, short circuit protection, and reverse protection, along with the equalizing charge feature, more safe and stable
• Onboard 5V regulator, up to 5A continuous output current, more sufficient power source for Raspberry Pi
• 5V USB output, convenient for powering other boards
• Batteries warning indicators, easy to check if the battery is connected correctly
• Comes with development resources and manual

• The 18650 batteries are NOT included
• Please note that the battery length SHOULD be less than 67mm, some batteries with protection plate in the market are NOT supported, learn more.

• Sensitivity Range: 90V-1000V AC 50-60Hz
• Voltage Indication: Beeper, LED Flashing
• Power Requirement: 2 AAA batteries (not included)
• Dimension: 160 x 17 x 18mm
• Auto power-off:Yes
• Low Battery Power Indication:Yes

• Wide Testing Range,within 90-1000V AC (Malaysia is 240VAC), All Electric Appliances in Your Family can be Tested by it.
• High Efficiency. As long as voltage is detected, the LED in the tester pen will illuminates. It is easy to notice. And this voltage pen detector is powered by 2 AAA batteries(not included).
• 100% Safe. The Voltage Pen Tester detects Voltage in a non-contact way, so do not worry about there could be any possibility of being shocked by the electricity.
• High Quality. Being a home electrician , you will do the job better with it.
• Easy to use. LED in the voltage tester pen can illuminate the working environment. You can use the Non Contact Voltage Detector in circuit breakers, lighting fixtures, switches, outlets, wires and anywhere you need it.