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A crystal radio receiver built into a transparent acrylic tube.
Observation of soil pH using a pH meter at each coordinate point
Measuring electric current through a resistor with an ammetter. 490 milliamperes of current flows through the resistor.Focused on resistor.
In a well-equipped workshop, a man is seen professionally repairing a device, displaying his technical expertise.
Curta hand-held mechanical calculator top on a desk
Clock bomb. 1 second to explosion.
Camera Dials and Controls on an antique 35mm rangefinder type camera.
Old pager, old-fashioned buzzer.
A 3D rendering of an antique polygraph machine, isolated on a white background.
observation of soil moisture at each coordinate point
old electrical potentiometers
multimeter close up
Old, analog, 1970s multimeter or multitester or Volt-Ohm meter, an electronic measuring instrument that combines several measurement functions in one unit.
Old style meter and computer parts.  STEM
Closeup of old dirty camera parts
Low key black and white macro close-up of the volume knob on an old stereo, both knob and device are black, text and numbers are white
Electromagnetic Field Detector or EMF detector.
Closeup of a mass produced computer joystick from the 1980s on a white background.
Analog multimeter and its probes. Selected focus. Voltmeter, ohmmeter and ammeter all in one  body.
Buzzer Alarm  part on table
Potentiometer without knob. Variable resistance. Electronic components.
Closeup of a 1940's -era radio dial
soviet electrical pyrography pen device on white background
Technician holding a digital compact camera. Harsh shadow
Electronic component of old analog TV and radio hardware - variable resistor. Close-up. Isolated on white  background.
In a well-equipped workshop, a man is seen professionally repairing a device, displaying his technical expertise.
Stock picture of pyrography pen , tools and creative hobby work. Copy space.
camera shutter button
stock pictures of a geiger counter used to detect traces of nuclear radiation
black hair clipper
Free Images: "bestof:The Brown Portable Potentiometer Model 126V pic2.JPG The Brown Portable Potentiometer Model 126V own 2012-07-07 09 53 11 AlfvanBeem CC-zero Potentiometers"
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