Resistance Substitution Box
Product Code : LSK-EAE-11111
Resistance Substitution Box (SKU LSK-EAE-11111) lets you dial a ready-made resistor into a circuit instead of soldering trial values: it switches between 24 standard resistances from 10 Ω to 1 MΩ. The values are the ones most used in solid-state circuits, so it suits electronics practicals, circuit design and fault-finding in colleges, polytechnics and training labs. Science Lab Supplies manufactures the box in Saha, Ambala, India (Plot 448, HSIIDC Industrial Area) and supplies it direct to schools, colleges and distributors.
Specifications
The table below lists every specification of the box. In short, it offers 24 selectable steps covering 10 Ω to 1000 kΩ (1 MΩ), with every resistor rated at 1/2 W and held to 5% tolerance, which makes it a quick way to try values in circuits under design or test.
| Specification | Value |
|---|---|
| SKU | LSK-EAE-11111 |
| Type | Resistance substitution box |
| Resistance range | 10 Ω to 1000 kΩ (1 MΩ) |
| Number of steps | 24 |
| Value selection | Values most commonly used in solid-state circuits |
| Resistor tolerance | 5% (all resistors) |
| Resistor power rating | 1/2 W (all resistors) |
| Purpose | Finding the required resistance in circuits under design or test |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Resistance Substitution Box
Instead of swapping individual resistors on a breadboard, students wire the box into the circuit and step through values until the circuit behaves as required, then fit that value permanently. This saves time and parts, making it practical physics lab equipment in India for electronics and circuit-design work.
- Class 12 physics and B.Sc. electronics: setting transistor bias, LED current and voltage-divider resistances by trial, powered from a Laboratory Battery Eliminator.
- Ohm's law and series-parallel exercises with a wide range of known resistances.
- Diploma, polytechnic and ITI electronics trades: fault-finding by substituting a suspect resistor.
- Checking resistance-measuring instruments such as the Ohm Meter against the 24 set values.
Each resistor is rated at 1/2 W: work out the power in the circuit (I²R) before selecting low values at higher currents.
Standard Scope of Supply
The Resistance Substitution Box is supplied as a single unit as described above, with its 24 resistance steps from 10 Ω to 1 MΩ. Power supplies, meters and connecting leads are separate items, and any optional accessories are listed on the quotation.
Packing, MOQ and Lead Time
A quotation can be raised for one box or for a batch covering every electronics workstation. Science Lab Supplies sets out packing, delivery time and price for the quantity asked for, and resistor sets, meters or power supplies can be priced on the same quotation.
Science Lab Supplies holds an Importer-Exporter Code and can ship to buyers in Kenya, Ghana, Ethiopia, Tanzania, Uganda and the UAE. Enquiries go through the contact page or the enquiry cart, while tender buyers can follow the lab tender page.
Frequently Asked Questions
What range does the Resistance Substitution Box cover?
It covers 10 Ω to 1000 kΩ (1 MΩ) in 24 steps. The steps are the resistance values most commonly used in modern solid-state circuits.
How accurate are the resistors and how much power can they take?
Every resistor in the box has a 5% tolerance and a power rating of 1/2 W. For precision bridge work, a plug-type box with constantan or manganin coils is the better choice.
How is a substitution box different from a decade box?
A substitution box offers a fixed set of commonly used values, one at a time, for quick trial in a circuit. A decade box adds dial settings together to build any value within its range.
Is Science Lab Supplies the manufacturer or a trader?
The box is manufactured by Science Lab Supplies itself at its Saha, Ambala plant in India. Prices and delivery terms are therefore quoted by the manufacturer, not by an agent or trading firm.
Related Resistance Boxes and Resistor Sets
These Electrical and Electronics, Lab Meters and general physics items cover other ways of providing and measuring resistance, from a compact substitution unit and decade or plug boxes to resistor sets and an ohmmeter, so a complete circuit bench can be quoted together.
- Resistance Substitution Box (compact) — 12 switched resistors, 5%, 1 W, rotary switch and two 4 mm terminals.
- Decade Resistance Box, Dial Type — 1% metal film decades in two, three or four dials.
- Resistance Box Plug Type (Constantan / Manganin Coil) — plug box accurate to ±0.02% with manganin coils.
- Resistance Box Electronic Type — versions of 50, 100, 500 and 1000 Ω.
- Resistor Element Set with Holders/Clamps — 1, 2, 10, 100 Ω and 1 kΩ metal film resistors.
- Resistors with Gradual Increase of Resistance — set of five, 1 Ω to 1 kΩ, 7 W, with stands.
- Digital Ohmmeter 20 kΩ — digital resistance meter with a 20 kΩ range.
Browse the full Electrical and Electronics range, the Lab Meters range for ohmmeters and meters, or all physics lab equipment.
Last updated: 9 October 2026
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