Post Office Box, Plug type

The 3-Ratio P.O. Box has sixteen non-inductively would coils 1, 2, 2, 5, 10, 20, 20, 50, 100, 200, 200, 500, 1000, 2000, 2000, 5000 ohms and two proportional arms each with coils of 10, 100, 1000, ohms. The 4-Ratio P.O. Box has sixteen coils as above and two proportional arms each with coils of 1, 10, 100, 1000, ohms. The whole system is contained in a superior quality wood box. Resistance between 0.1 and 1111000 ohms can be accurately measured using a DC battery. Two spring keys having good contact for battery and galvanometer is also provided. Also incorporates infinity gap. Available in 3-Ratio and 4-Ratio. P.O. Box 3-Ratio and 4-Ratio (Constantan coil) consists of 12mm & 14mm thick rectangular brass block and have accuracy ±0.1%. P.O. Box 3-Ratio and 4-Ratio (Manganin coil) consists of 12mm & 14mm thick rectangular brass block and have accuracy ±0.05%. Contact SLEI for your School, College Science Physics Chemistry and Biology Lab Equipments. We are the best and renowned educational lab equipments manufacturers, educational lab instruments manufacturer, educational laboratory glassware exporter, educational laboratory microscopes, educational laboratory suppliers, educational scienitific lab equipments in Ambala, India.