For demonstrating sympathetic vibration and resonance. Two matches, steel or aluminum with spring control and magnetic damping. Basic movement of meter calibrated to 5mA, 100mV. Long, pointer, needle, with thick arrowhead for clear visibility from a distance, moves on hardened and polished steel pivots and jeweled bearings. Mounted is sturdy, plastic frame with transparent front and back windows. One side of frame has color-coded, 4mm socket terminals for electrical and a slot for inserting or removing scales; other side has zero adjustment knob for locking pointer needle. Any one removable, large scale with graduations on both sides can be selected from demonstrates meter can be raised or lowered.
TUNING FORKS SET, LARGE DIFFERNTIAL AND SYMPATHETIC
As tuning fork set, differential and sympathetic but large in size, matched tuning forks of frequency 256Hz Resonance boxes, 29x12x8 cm, with rubber feet. Boxes are large enough for conveniently putting a hand inside to mount the tuning forks.

Price:
Equipment Materials : Plastic Housing and Metal Components
Core Components : Needle Display Builtin Resistors
Automation Grade : Manual
Type : DC Millivoltmeter
Power Source : Passive (No external power required)
Dimension (L*W*H) : Approximately 15cm x 10cm x 10cm
Equipment Materials : Copper Acrylic Steel
Core Components : Copper coil Base stand Electrical components
Automation Grade : Manual
Type : Electromagnetic device
Power Source : AC mains
Dimension (L*W*H) : Approx. 20x15x25 cm
Equipment Materials : Metal Body with Perforated Sheet Cover, Ceramic Core, HighQuality Resistance Wire
Core Components : Ceramic Tube, Resistance Wire, Sliding Contact, Metal Frame
Automation Grade : Manual
Type : Wire Wound Rheostat
Power Source : Manual Operation
Dimension (L*W*H) : Approx. 200 x 60 x 60 mm (may vary by capacity)
Equipment Materials : Borosilicate glass tube, metallic base, rubber pump, high grade plastic scale
Core Components : Glass tube, scale, mercury or colored liquid column, pump, valve
Automation Grade : Manual
Type : Boyles Law Simple Form
Power Source : Manual (no electrical power required)
Dimension (L*W*H) : Approx 45 cm x 12 cm x 18 cm
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