0.5X barlow lens RF4

Stepper motor 28BY J-48 with Driver ULN2003

the ULN2003 stepper motor driver or in English stepper motor, unipolar (4 phases/ 5 wires ) allows you to easily plug the small motor 28BY J-48 5v gràce to the 5 pin male connector and connects easily to an arduino or other through a 4 pin connector for control signals and Gnd (ground/-). The power supply of ULN2003 is between 5 and 12V.

This is 125K RFID Tag. The RFID technology is used for sensing and identifying tagged people and objects for access control, automation, and a whole range of different applications.

Operating on a frequency of 125kHz, these tokens are all pre-programmed with unique ID numbers to communicate wirelessly with RFID Readers over distances of around 10cm or less. This means you can attach it to vehicles or items, keyrings or even pets’ collars to keep track of the location via an array of readers in the office, warehouse or home.

12mm 12528 LDR is a type of photoresistor with a 12mm diameter and the model number GL12528, which changes its resistance based on the intensity of light it is exposed to. The resistance of the component is high in the dark and drops significantly as light increases, making it useful for detecting ambient light levels

Ardess Digital Mini Thermometer with cable allows you to easily and fast know the environment temperature around you anywhere
The thermometer comes with 1m cable metal sensor probe, perfect for use in refrigerator, aquarium tank, fish tank,pet cage, kitchens,3D printer, solar system, cellar,humidors, incubator or any other places that require monitoring of temperature.

The MQ3 analog gas sensor is suitable for detecting alcohol; this sensor can be used in a breathalyzer.
It has high sensitivity to alcohol and low sensitivity to gasoline.
The sensitivity can be adjusted using a potentiometer.