Post Office Box, Plug Type
Product Code : EL-E-10283
Last updated: 6 October 2026
Quick answer: Post Office Box, Plug Type is a physics laboratory apparatus manufactured by Ambala Science Lab in Ambala, Haryana, India, and supplied to schools, colleges, nursing and medical teaching institutions in India and export markets.
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%.
Technical specifications
Specification |
As published |
Product type |
Physics laboratory apparatus |
Thickness |
14mm |
Materials stated |
brass, wood |
Manufactured in |
Ambala, Haryana, India |
Only the figures published for this model are listed above. Confirm overall size, moulding material, packing dimensions and gross weight in writing before ordering, particularly for tender or export consignments.
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Range and ordering
This item is part of the Electrical range within Physics Lab Equipment. Bulk, tender and OEM quantities, including buyer branding, are handled through lab tenders and OEM orders. Email [email protected] or use the contact page.
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