The demostration meter is used to demostrate the working principle of AC and DC Ammeter, Voltmeter and Galvanometer with the help of interchangeable plastic Scales. Amagnetically damped spring controlled moving coil movement is housed in a plasic case with glass front and rear panel. A pair of 4 mm socket terminals is give on the right side to apply voltage and current. A special locking arrangement and a centrl / side zero adjustment control is given on the left side with the help of two knobs. The interchageable scales are boldy marked on both sides enabling the class to view from the front and the demostrator from the rear. Each scale is fitted through a slot on the right side of the case and has a plug connector which also serves to locate and align the scale positively in position. Locking system is provided to lock the pointer to aovid damage is transist. Basic Movememt : 5mA - 100 m V F.S.D. Scale Lenght : 200 mm approx. Accuracy : ± 2.5 % F.S.D. Dimensions : 300 x 150 x 300 mm approx. Weight : 2 kgs. approx. Supplied with three standard scales.