Fluid Mechanics Physics Equipments Lab Equipment Manufacturer, Supplier and Exporter in India

Thirty-six items are listed here, FMPE-0001 to FMPE-0036: barometers and manometers, pumps, hydrometers, specific gravity bottles and the classical pressure demonstrations. Before choosing anything from the pressure-measuring part of this range, read the section immediately below. Several of the instruments in this category are traditionally mercury-filled, and mercury measuring instruments are subject to an international phase-out that many countries now enforce at the border. There are mercury-free alternatives for every measurement in this listing, and they are named below.

Mercury instruments: check before you order, and know the alternatives

Mercury-containing measuring devices, which includes barometers, manometers, thermometers and sphygmomanometers, are covered by the international agreement on mercury to which India and most importing countries are party, and their manufacture, import and export are restricted or prohibited under it and under national law in many markets. Elemental mercury supplied on its own is separately controlled. The practical consequences for a school or college buying from this page:

• Ask the supplier, in writing, which codes contain mercury and whether each is supplied filled, unfilled or not at all. A siphon barometer, a barometer tube, a Fortin barometer, a Bennert vacuum gauge and a mercury manometer are all traditionally mercury instruments, and the listing does not say what is in them.
• Check your own import rules before ordering, not after. If your country restricts mercury instruments, a consignment can be refused at the border and the loss falls on you.
• A mercury-free equivalent exists for every measurement here, for buyers who need or prefer one. For atmospheric pressure, the aneroid barometer (FMPE-0001) needs no mercury at all. For gauge pressure, the Bourdon gauge (FMPE-0006) is the standard mercury-free instrument. For differential pressure in teaching, a water or oil-filled U-tube (FMPE-0036) or an electronic pressure sensor does the same job, with a coloured liquid that students can actually see. Ask the supplier what they can supply mercury-free and specify that on the order.
• Check the rules before ordering loose mercury. FMPE-0029 and FMPE-0030 are a mercury bottle and a mercury trough. Elemental mercury is controlled separately from mercury instruments in most jurisdictions, and holding and disposing of it brings obligations an institution has to be set up for, so confirm that yours is permitted to receive, store and dispose of it before you order.

If your laboratory already has mercury instruments, the hazard is the vapour rather than the liquid, so: keep them intact and upright, never heat them, store them where they cannot be knocked over, and do not improvise a clean-up if one breaks. A spill is not swept up and never vacuumed; it needs the proper absorbent kit and your institution's procedure, and the room should be ventilated and vacated while that is arranged. Plan the eventual disposal of old mercury apparatus through a licensed route rather than keeping it in a cupboard indefinitely.

The range, by topic

What the listing leaves out, and what to ask

• Range and scale, for every instrument that measures. Ask the pressure range and the scale division of each barometer, manometer and gauge, and the range and scale of each hydrometer, because a hydrometer of the wrong range will not float usefully in the liquid you want to measure. Ask which hydrometer suits which application, since battery, Baume, Nicholson and universal instruments are not interchangeable.
• What fills it, and what you must supply. For U-tube and liquid manometers ask what liquid is specified, whether it is supplied, and whether a coloured liquid is available, which makes the reading visible from the back of a classroom. For the specific gravity bottles, ask the nominal capacity and whether the borosilicate version (FMPE-0034) is the one to buy if the liquid is at all aggressive or the bottle will be heated.
• What else the experiment needs. A balance for the specific gravity bottle and the Nicholson hydrometer; a vacuum pump for the Magdeburg hemispheres (FMPE-0026), which do nothing without one, so ask whether the pump is included or must come from elsewhere; a water supply and a drain for the pumps and the spouting cylinder; and a means of measuring flow if the Bernoulli tube is to be used quantitatively.
• Materials. Ask what each item is made of. Brass and borosilicate glass last; tin-plate and mild steel corrode in a school store, and these are items a department keeps for a decade.

The two apparatus that need a word of caution

FMPE-0017, the Bramah hydraulic press. This is the demonstration of Pascal's principle, and it works by generating a large force from a small one, which is exactly what makes it worth a safety brief. Ask the maximum force it develops and what limits it, whether a relief arrangement is fitted, what fluid it uses, and what is intended to be crushed in the demonstration; keep hands clear of the platen, and do not use it to press anything brittle that can shatter.

FMPE-0026, the Magdeburg hemispheres, and anything else evacuated. The hemispheres separate suddenly when air is readmitted, and glassware under vacuum fails all at once rather than cracking first. Ask what the apparatus is rated for, keep faces away while evacuating, and specify eye protection for the demonstration.

Also worth confirming

Quote the code rather than the name. Several names in this listing carry misspellings of the scientist the apparatus is named after, two codes cover the same Boyle's law experiment, two cover the same Hare's apparatus, and three of the barometer entries are near-identical, so a name alone is not enough to order from. The lung demonstration apparatus (FMPE-0025) is a biology demonstration that happens to use pressure, so expect it to sit oddly in a physics order. Ask also for dimensions, the manual with the expected result, the quantity per student group, and the warranty. Any figure quoted is confirmed in writing on the quotation; ask for its basis, and ask for written confirmation of the mercury position on every pressure instrument.

Related ranges on this site

Forces, density and upthrust apparatus is under Mechanics Physics Lab. Expansion, calorimetry and engines are under Heat and Engine Physics Lab Equipments, with Thermometers alongside, where the same mercury question applies. Weighing for the density experiments is under Lab Balances and Scales. Waves and oscillations are under Physics Sound and Waves Lab and light under Optics Physics Lab. Parent range: Physics Lab Equipments.

Request a quote

Send your practical list and state that you want mercury-free instruments wherever a measurement allows it. For example Aneroid Barometer (FMPE-0001), Bourdon Gauge (FMPE-0006) and U-Tube Manometer (FMPE-0036) with a coloured filling liquid, eight groups, with ranges, scale divisions and the mercury position confirmed in writing. Contact Ray Export for prices, ranges and lead times.

Frequently asked questions

Which instruments in this range contain mercury?

The listing does not say what is in them, which is why you should ask. The siphon barometer, barometer tube, Fortin barometer, Bennert vacuum gauge and mercury manometer are all traditionally mercury instruments. Ask the supplier, in writing, which codes contain mercury and whether each is supplied filled, unfilled or not at all. Check your own country's import rules before ordering: if mercury instruments are restricted where you are, a consignment can be refused at the border and the loss falls on the buyer.

What are the mercury-free alternatives for each pressure measurement?

For atmospheric pressure, the aneroid barometer (FMPE-0001) needs no mercury at all. For gauge pressure, the Bourdon gauge (FMPE-0006) is the standard mercury-free instrument. For differential pressure in teaching, a water or oil-filled U-tube manometer (FMPE-0036) or an electronic pressure sensor does the same job, and a coloured filling liquid makes the reading visible from the back of a classroom. Ask what can be supplied mercury-free, what liquid is specified for the U-tube and whether it is supplied, and state mercury-free on the order.

Should a school order the mercury bottle or mercury trough?

Only if the school is permitted, and equipped, to hold it. FMPE-0029 and FMPE-0030 are a mercury bottle and a mercury trough, and elemental mercury is controlled separately from mercury instruments in most jurisdictions. Holding and disposing of it brings obligations a school has to be set up for, so confirm your country's rules and your institution's procedure before ordering. If you already have mercury instruments, the hazard is the vapour: keep them intact and upright, never heat them, and store them where they cannot be knocked over. A spill is never swept or vacuumed; it needs an absorbent kit and your institution's procedure, with the room ventilated and vacated.

How do I choose between the hydrometers and specific gravity bottles?

Battery, Baume, Nicholson and universal hydrometers are not interchangeable, so ask which suits your application and the range and scale of each, because a hydrometer of the wrong range will not float usefully in the liquid you want to measure. For the specific gravity bottles, ask the nominal capacity, and choose the borosilicate version (FMPE-0034) if the liquid is at all aggressive or the bottle will be heated. Both the specific gravity bottle and the Nicholson hydrometer need a balance to be used.

What else do the experiments in this range need?

Several items do nothing on their own. The Magdeburg hemispheres (FMPE-0026) need a vacuum pump, so ask whether one is included or must come from elsewhere. The foot, force and lift pumps and the spouting cylinder need a water supply and a drain. The Bernoulli tube (FMPE-0005) needs a means of measuring flow if it is to be used quantitatively. Density work needs a balance. Ask also what each item is made of: brass and borosilicate glass last, while tin-plate and mild steel corrode in a school store.

Which apparatus here needs a safety brief?

Two. The Bramah hydraulic press (FMPE-0017) demonstrates Pascal's principle by generating a large force from a small one, so ask the maximum force and what limits it, whether a relief arrangement is fitted and what fluid it uses; keep hands clear of the platen and never press anything brittle. The Magdeburg hemispheres (FMPE-0026) separate suddenly when air is readmitted, and glassware under vacuum fails all at once rather than cracking first, so ask what the apparatus is rated for, keep faces away while evacuating and specify eye protection.

Key takeaways

• Get the mercury position in writing for every pressure instrument: filled, unfilled or not supplied.
• Mercury-free covers every measurement: aneroid barometer FMPE-0001, Bourdon gauge FMPE-0006 and a liquid-filled U-tube FMPE-0036.
• Confirm the rules before ordering loose mercury; the mercury bottle and trough (FMPE-0029, FMPE-0030) bring storage and disposal obligations your institution must be able to meet.
• Range decides whether a hydrometer is usable, and the battery, Baume, Nicholson and universal types are not interchangeable.
• Some items need other equipment: a vacuum pump for FMPE-0026, a balance for density work, water and a drain for the pumps.
• Order by code, not by name: duplicate and near-identical entries mean a name alone is not enough.

About this page

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, ranges and scale divisions are confirmed in writing on the quotation, together with the mercury position of each pressure instrument; for certificates, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing notes: several product names misspell the scientist the apparatus is named after; FMPE-0007 and FMPE-0008 cover the same Boyle's law experiment, and FMPE-0015 and FMPE-0016 the same Hare's apparatus; three barometer entries are near-identical; FMPE-0025, the lung demonstration apparatus, is a biology item; and the listing does not state which codes contain mercury.