tender for purchase of physics lab equipments for department of physics , physics lab equipments , traveling vernier microscope with brass metal / ss horizontal scale 20 cm and vertical scale 14 cm, least count = 0.001 cm and vernier = 0.01mm with magnifier lens, provided with the best quality achromatic objective and 10x ramsden eye piece with fine cross line wire. complete with nicely polished wooden box. , photo-electric effect, - complete setup to determine the plancks constant planck constant by photoelectric effect : photosensitive device : cs vacuum photo tube , light source : halogen tungsten lamp12v/35w , color filters : 635nm(red), 570nm(orange), 540nm(yellow), 500nm (green), 460nm (blue), accelerating voltage : -15v to ov & o to 15v, ± 2% , output : ±15v continuously variable through multi-turn pot , display : 3½ digit 7-segment led , accuracy : ±0.2% , current detecting unit : digital nano ammeter , range : 10001.1a, 1001.1a, 10[ta a 1 μa , resolution : 1na , display : 3½ digit 7-segment led , accuracy : ±0.2% , power requirement : 220v ± 10%, 50hz , current multiplier : ×1, × 0.1, ×0.01 & ×0.001, scale : length 400 mm , dark- current : 0.003μa , measuring error : ± 15% compared with the recognized value (h=6.62619 ×10-34j.s) . .