Gravity: Analog pH Sensor/Meter Kit

This tiny little board features two chips from Maxim Integrated: MAX32664 and MAX30101. The 30101 Oximetry module  is the sensor on board responding for both oximetry and heart rate sesnsing. The MAX32664 is equipped with a Cortex M4 handling algorithimc calculations, digital filtering and automatic gain control. The board comes with I2C and SparkFun has provided to it Qwiic connectors for ease of use.

Ethanol alcohol sensor module.
MQ gas sensor uses a small indoor heater with an electrochemical sensor.
When the alcohol molecules in the air comply with the electrode the ethanol "changes" into acetic acid and then more current is produced.
MQ-3 Alcohol Sensor Module Ethanol Breathalyzer features:
- Main chip: alcohol sensor MQ-3 and comparator LM393
- Working voltage: 5V
- Current: 150mA
- Digital output: TTL 0/1
- Analog output: analog voltage sensing value
- Detection concentration:
- 0.05mg/L - 10mg/L
- Quick response features:
- Adjustable sensitivity with the potentiometer
- Size: 32mm x 20mmx 18mm

Perfect kit to learn programming in the middle of Arduino the basic of electronics It allows to build various projects of various complexity, from the easiest ... to the most complicated.
The elements are placed in the box to keep everything in order.   Characteristic:   It includes the following module references:   - 1x UNO R3 Rev3 ATmega328 ATmega16U2 Development Board Arduino Module - 1x LED Display Screen Controller Blue Backlight 16x2 1602 HD44780
- 1x Prototype Protoboard MB-102 830 points Arduino
- 1x ProtoShield Prototype Expansion Board with Mini Breadboard 170 points for Arduino Proto V5.0
- 1x 74HC595 74595 SN74HC595N 8-Bit Shift Register DIP-16
- 1x LM35 Temperature Sensor LM35DZ TO92
- 2x SW-520D Vibration Tilt Sensor

Encapsulated with water resistant stainless steel with sensor dimensions 5,5 * 50mm, cable length 100 cm.
DS18B20 Submersible Probe Sensor Temperature features:
- Based on the DS18B20 chip
- Supply voltage: 3 ~ 5.5V
- Consumption <5mA
- Measuring Range: -55 °C to 125 °C
- Accuracy: +/- 0,5ºC
- Outputs: - GND black
      - Red Vcc
      - Yellow digital output
- Inocidable steel
- Cable length: 1m

EMG Muscle Signal Sensor Signal Electromyography features:
EMG Muscle signal sensor module kit with 6 disposable electrodes The EMG sensor serves as a bridge to detect small electrical pulses product of
muscle activity and transform them into a signal recognizable by Arduino. NOTE: DO NOT USE THIS SENSOR FOR MEDICAL PURPOSES.
Code Examples: https: //github.com/AdvancerTechnologies/MuscleSensorV3

16GB Class 10 MicroSD memory card with adapter features:
- Capacity 16GB
- Class 10
- Dimensions of the microSD 11 mm x 15 mm x 1 mm
- FAT32 format
- Operating temperature -25 ° C to 85 ° C
- Storage temperature -40 ° C to 85 ° C
- Voltage 3.3 - Includes adapter

The module has two outputs: analog A0 and digital D0.
digital output D0 - signal 0 or 1 appears depending on the configuration of threshold.
The threshold is fixed with the potentiometer. Characteristic: - Operating voltage: 3.3V -5 V - Sensitivity adjustable by potentiometer
- Dual output mode: analog and digital
- Red LED - power indicator
- Green LED - digital switching output indicator
- Measurements PCB: 3 x 1.5 cm
- Sensor measurements: 5.4 x 3.9 cm

This small 10-DOF sensor module GY-91 is more compact than the GY-80 module.
The module uses a unique MPU-9250 chip combination with built-in 3-axis gyroscope, 3-axis accelerometer, digital compass and BMP280 enhanced barometric pressure sensor.
The MPU-9250, delivered in a 3x3x1mm QFN package, is the smallest 9-axis MotionTracking device in the world and incorporates the latest InvenSense design innovations, allowing dramatically reduced chip size and power consumption, while improving the performance and the cost. Enhancements include low-power accelerometer mode support with only 6.4μA of and provides improved 16-bit compass data resolution (0.15 μT per LSB).