Secchi Disc with Holding String Subcategory_Stopcocks Slit-and-solid pendulum pair plus high-field

Slit-and-solid pendulum pair plus high-field magnet for the demountable transformer

this microphone amplifier connects a microphone input to both an integrated speaker and an oscilloscope-driving amplified signal for waveform study

supplying the plastic-coated counterpart to bare copper for circuit wiring where exposed conductor must be avoided

Regulated dual-output power supply showing independent LED readouts of voltage and current

Integrated heart

Secchi Disc with Holding String Subcategory_Stopcocks Slit-and-solid pendulum pair plus high-fieldLowers into ponds, lakes, or streams on its holding string until the alternating black and white quadrant pattern disappears, giving a direct field reading of water clarity.