Adjustable Slit Manufacturer,Supplier and Exporter in India
Product Code : EL-BE-9858
Jlab Export is a leading Adjustable Slit Manufacturer,and suppliers in India
Adjustable Slit (code EL-BE-9858) is an optics accessory that turns a light source into a narrow line of light of variable width, used for diffraction, interference and spectrum experiments in school and college physics labs. A screw-controlled, spring-loaded precision slit sits on a 75 mm blackened metal disc, and its drive is arranged so the slit cannot be over-tightened. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Screen | Circular blackened metal screen, 75 mm diameter |
| Central aperture | 12.5 mm |
| Slit | Screw-controlled, spring-loaded precision slit mounted on one side of the disc |
| Over-tightening protection | Adjustment drive arranged so that the slit cannot be over-tightened |
| Jaws and slides | Levelled jaws on brass, dovetail-section slides |
| Maximum slit opening | Approx. 4 mm |
| Useful slit length | 10 to 12 mm |
| Quality check | Each slit is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-BE-9858 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with the JLab Micrometer Slit?
| Model | Adjustment | Reading the slit width |
|---|---|---|
| This adjustable slit (EL-BE-9858) | Screw-controlled, spring-loaded; drive cannot over-tighten the slit; opens to approx. 4 mm | No scale listed |
| Micrometer Slit | Heavier screw thread, 0.5 mm pitch x 6 mm diameter | Drum divided into 50 divisions giving a reading of 0.01 mm; index with a 5 mm scale in 0.5 mm divisions |
Choose this adjustable slit when you set the width by eye from the image on the screen, as in most teaching experiments. Choose the micrometer slit when the slit width itself has to be read and recorded.
What Is the Adjustable Slit Used For?
Placed in front of a lamp, the slit acts as a narrow line source. On an optical bench it is used for single-slit diffraction, where the central bright band spreads out as the slit is narrowed, and as the source slit for double-slit interference, for viewing spectra through a prism or diffraction grating, and for lens experiments that need a sharp line object. These topics appear in class 12 wave optics practicals under CBSE and ICSE and in undergraduate physics labs. Narrowing the slit gives sharper fringes and spectral lines but a dimmer image, so the usual practice is to open it until the pattern is bright enough and then close it slowly until the detail is clear.
The blackened finish of the disc cuts down stray reflections around the slit. Turn the adjusting screw gently, keep the jaw edges clean and free of scratches, and store the slit in a dust-free box.
What to Specify When Ordering
- Plain adjustable slit or micrometer slit — depending on whether the width has to be measured.
- Mounting — check that your bench or spectrometer holder accepts a 75 mm diameter disc.
- Quantity — the minimum order is 10 units; benches, lamps and gratings can be added to the same enquiry.
Frequently Asked Questions
How wide can the slit be opened?
The maximum slit opening is approx. 4 mm, with a useful slit length of 10 to 12 mm. It closes down to a fine line by turning the screw.
Can the slit jaws be damaged by over-tightening?
The adjustment drive is arranged so that the slit cannot be over-tightened, which protects the levelled jaws. They still need careful handling and clean storage.
Does it have a scale to read the slit width?
No scale is listed for this model. The JLab Micrometer Slit has a drum divided into 50 divisions that gives a reading of 0.01 mm, so choose it if you must record the width.
Will it fit my optical bench?
The slit is built on a 75 mm diameter blackened metal disc with a 12.5 mm central aperture. Compare that diameter with your bench holder, or ask JLab before ordering.
Who manufactures this adjustable slit?
Jain Laboratory Instruments Pvt Ltd, trading as JLab, makes it at its works in Ambala, Haryana, India, and quotes for it as the manufacturer.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a physics, optics and general laboratory equipment manufacturer in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The adjustable slit is made in JLab’s own works rather than bought from a trader, so schools, colleges, dealers and importers order it factory-direct; each piece is visually inspected before dispatch, and repeat orders are made by the same manufacturer. JLab exports worldwide and ships to buyers in every region — for instance Mexico in North America, Gabon in Central Africa, South Korea in East Asia, Afghanistan in South Asia and Malta in Southern Europe. For tenders, see the JLab lab tenders page.
Related Optics Equipment
- Micrometer Slit — a slit with a drum micrometer for reading the width to 0.01 mm.
- Optical Bench — a wooden bench with a 100-cm scale, riders and lens, mirror and screen holders.
- Diffraction Grating — disperses light from the slit into its component wavelengths.
- Spectrometer — a heavy cast-metal spectrometer whose collimator tube carries a fixed slit.
The slit is listed in the Biology Equipment range of the Biology Lab Equipment section.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), whether you need the plain or micrometer slit, any bench or holders to go with it, and your delivery location through the contact page.
Last updated: 4 October 2026
