ELECTRICAL TUNING FORK -HLSI
On sturdy streamlined base with provision for horizontal or vertical use. Fork is manufactured from selected steel. Prong is 10x25x300mm. Accurate frequency adjustment, chrome plated, vibration rate 60 per second. Electromagnet can work on 6 volts. The amplitude of vibration can vary by sliding the electromagnet inside prongs. Complete with stylet, mirror and counterpoise.