Quick answer. Read this as a degree-level physics range, and specify it by least count rather than by name. Although catalogued under electronics, the ELT series is B.Sc. and engineering physics apparatus, and its strongest part is ten optics practicals whose results depend on the quality of the optics and the stability of the bench. So the questions that matter are the least count of the spectrometer's circular scale (ELT-0029), the optical flat behind Newton's rings (ELT-0026), the vernier on the travelling microscope (ELT-0030), and the laser class of any laser experiment, confirmed in writing before the equipment arrives.
This listing is catalogued under electronics, but almost everything in it is degree-level physics laboratory apparatus: the ELT series, which runs to at least ELT-0030 across six pages and covers electrostatics and magnetism, mechanical properties, electrical bridges, and a substantial optics section. The product names themselves say "For Physics Electric Labs". If you are equipping a B.Sc. or engineering physics laboratory this is the right range; if you came here for electronics trainers, the links at the end point to the actual electronics ranges.
| Topic | Codes | Experiments covered |
|---|---|---|
| Electrostatics and magnetism | ELT-0001 to ELT-0005 | Electrostatic lab trainer, magnetism lab trainer, Van de Graaff generator, inverse square law demonstrator, Coulomb's law demonstrator |
| Mechanical properties | ELT-0006 to ELT-0008 | Moment of inertia table, viscosity measurement apparatus, Young's modulus setup |
| Electrical measurement bridges | ELT-0009, ELT-0010 | Post office box trainer, De Sauty and Schering bridge trainer |
| Optics: interference, diffraction and polarisation | ELT-0021 to ELT-0030 | Resolving power of a telescope, ray optics study setup, divergence of laser, half shade polarimeter, Malus law setup, Newton's ring apparatus, measurement of laser wavelength by diffraction grating, light sources, spectrometer setup, travelling microscope |
The final page also carries four items coded in other series: two basic electronics trainers (BET-0010, a clipper and clamper trainer, and BET-0025, a Kelvin bridge trainer), a DC motor speed control trainer in the instrumentation series (IT-0035), and a mobile phone trainer in the communication series (C-0031). Those four belong to their own ranges, which are linked below.
Ten of the codes cover the standard degree optics practicals, and they are the ones most worth specifying carefully because the result depends entirely on the quality of the optics and the stability of the bench:
| Experiment | What to confirm |
|---|---|
| Spectrometer setup (ELT-0029) | The least count of the circular scale, which determines what wavelength resolution is achievable; the prism or grating supplied; and whether a collimator and telescope with adjustable slits are included. |
| Newton's rings (ELT-0026) | The lens radius of curvature, the quality of the optical flat, and the microscope used to count the rings. This experiment fails on a poor flat more than on anything else. |
| Travelling microscope (ELT-0030) | The least count of the vernier, which is the measurement in several of these practicals, and the travel in both axes. |
| Laser experiments (ELT-0023, ELT-0027) | The laser wavelength and output power, and the laser class. Any laser in a student laboratory needs its class confirmed in writing, together with the safety requirement that attaches to that class: beam enclosure or stops, warning signage and whether eyewear is required. Ask what is supplied and establish your institution's own requirement before the equipment arrives. |
| Polarimeter and Malus law (ELT-0024, ELT-0025) | The least count of the analyser scale, the light source supplied, and whether sample tubes are included. |
| Diffraction grating (ELT-0027) | The grating lines per millimetre or per inch, and whether a spare grating is available. Gratings are easily damaged by fingers. |
| Light sources (ELT-0028) | Which lamps, since a sodium lamp and a mercury lamp give different lines and the practicals specify one or the other. Ask the lamp life and the replacement cost. |
The actual electronics ranges on this site are Basic Electronics Trainers for device characteristics, oscillators and logic; Digital Analog Trainers and Kits; Microprocessor Trainers and Kits; Embedded System Trainers; Communication and RF Trainers, which is where the mobile phone trainer belongs; Instrumentation Trainers, which is where the DC motor speed control trainer belongs; and Power Electronics Trainers.
School-level physics apparatus by topic is under Physics Lab Equipments, including Optics Physics Lab and Electrostatic Physics Labware. Engineering physics apparatus is under Physics Lab For Engineering Students. Parent range: Electronics Lab Trainer Kits.
Send your physics practical list with the number of student groups, and ask for the least count or accuracy of every measuring instrument and the laser class of any laser experiment. For example Spectrometer Set-up (ELT-0029) with the scale least count and the grating specification, six units, with the manual. Contact Ray Export for prices, specification sheets and lead times.
No, despite where it is catalogued. Almost everything in the ELT series is degree-level physics laboratory apparatus for B.Sc. or engineering physics: electrostatics and magnetism, mechanical properties, electrical bridges and a substantial optics section. If you need electronics trainers, look under Basic Electronics Trainers, Digital Analog Trainers and Kits, and the Microprocessor, Embedded System, Communication and RF, Instrumentation and Power Electronics trainer ranges. Four items on the final page, BET-0010, BET-0025, IT-0035 and C-0031, also belong to those ranges rather than this one.
For the Spectrometer Set-up (ELT-0029), ask for the least count of the circular scale, because that determines what wavelength resolution is achievable. Ask whether a prism or a grating is supplied, and whether a collimator and telescope with adjustable slits are included. If you will measure wavelength with a grating, ask the lines per millimetre or per inch of the grating supplied with ELT-0027, and whether a spare grating is available, since gratings are easily damaged by fingers. Give the number of units with the manual.
This experiment fails on a poor optical flat more than on anything else. For Newton's ring apparatus (ELT-0026), ask for the lens radius of curvature, the quality of the optical flat and the microscope used to count the rings. The rings are commonly read with a travelling microscope, so for ELT-0030 ask for the least count of the vernier, which is the measurement in several of these practicals, and the travel in both axes. Have both figures confirmed in writing before you order.
For the laser experiments (ELT-0023 and ELT-0027), ask for the laser wavelength, the output power and the laser class. Any laser in a student laboratory needs its class confirmed in writing, together with the safety requirement that attaches to that class: beam enclosure or stops, warning signage and whether eyewear is required. Ask what is supplied and establish your institution's own requirement before the equipment arrives. The Van de Graaff generator (ELT-0003) also needs its safe operating guidance, and students should be briefed before it is run.
It depends on the practical. A sodium lamp and a mercury lamp give different spectral lines, and the practicals specify one or the other, so state which lamps you need with the light sources code (ELT-0028) and ask the lamp life and the replacement cost. For the half shade polarimeter and the Malus law setup (ELT-0024, ELT-0025), ask the least count of the analyser scale, the light source supplied and whether sample tubes are included, so each practical arrives with the source it was written for.
Ask, because the answer decides whether you have an experiment. For the post office box trainer and the De Sauty and Schering bridge trainer (ELT-0009, ELT-0010), ask the range and accuracy and whether a galvanometer and standards are included: a bridge without its null detector is not an experiment. For Young's modulus and viscosity (ELT-0007, ELT-0008), ask which method the apparatus uses and whether weights, wires or test liquids are included. For the moment of inertia table (ELT-0006), ask for the bodies supplied with their masses and dimensions.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.
Specifications, least counts and laser classes are confirmed in writing on the quotation. For certificates, standards or approvals, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing notes: this physics range is catalogued under electronics; ELT-0011 to ELT-0020 do not appear in the table above; the final page carries four items from other series (BET-0010, BET-0025, IT-0035 and C-0031); several codes carry a trailing type 1 or type-2 with no stated difference; and every name ends with the suffix For Physics Electric Labs, a site convention rather than a specification.
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