Thermometers Lab Equipment Manufacturer, Supplier and Exporter in India

Twenty-six thermometers are listed here, PLET-0001 to PLET-0027, in four kinds: spirit-filled, mercury-filled, dial, and the two special instruments, the maximum-and-minimum and the wet-and-dry. The first decision is not the range but the filling, and the useful fact about this listing is that the mercury-free choice is already in it: the spirit-filled thermometers (PLET-0006 to PLET-0009) and the dial thermometers (PLET-0003, PLET-0004) cover most school and college measurements without mercury at all.

Mercury thermometers: check before you order

Twelve codes in this listing carry the word mercury in their own product names: the two maximum-and-minimum instruments and ten mercury-in-glass thermometers in white-backed and yellow-backed forms. Mercury thermometers are named in the international agreement on mercury that phases out mercury-added products, India is party to it, and many importing countries now enforce the restriction at the border. So:

• Check your own import rules before ordering, not after the consignment is on the water. A refused shipment is the buyer's loss.
• Ask in writing which codes are mercury-filled, including the ones whose names do not say so. The clinical thermometers (PLET-0001, PLET-0002) do not state their filling, and mercury clinical thermometers are already prohibited in a great many markets.
• Specify mercury-free wherever the measurement allows it, which for school work is almost everywhere. Up to the ranges the spirit thermometers cover, order those; for robust general-purpose use, order the dial type; and above the spirit range, ask for a thermocouple or resistance-thermometer with a digital readout instead, since in this listing the higher ranges, to 250 and 360 degrees, are offered only as mercury.
• If you already hold mercury thermometers, the hazard is the vapour, not the liquid. Keep them intact, store them where they cannot roll off a bench, never heat one beyond its range, 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, with the room ventilated and vacated while that is arranged. Plan disposal of old stock through a licensed route rather than keeping it in a drawer.

What is in the range

The two questions that decide whether a reading is right

Immersion depth. This is the point most catalogues omit and most students never hear. A liquid-in-glass thermometer is made either for total immersion, where the whole liquid column sits in the medium, or for partial immersion to a marked depth. Reading a partial-immersion thermometer with more or less of the stem in the liquid than it was made for gives a wrong answer, and no amount of care with the eye position corrects it. Ask, for every code, whether it is a total or partial immersion instrument and, if partial, to what depth, and make sure that depth is in the practical instructions.

Scale division and tolerance. Ask the smallest scale division and the stated tolerance for each thermometer. A thermometer with no stated tolerance cannot support a quantitative result, and a one-degree division is not the same as one-degree accuracy. If any experiment in your syllabus depends on temperature, for example a calorimetry, band-gap or Planck constant measurement, ask whether a calibration certificate traceable to a national standard is available, and keep one calibrated thermometer aside as the laboratory reference to check the others against.

While you are asking, settle the practical details too: the overall length and the stem diameter, so the thermometer fits the hole in your calorimeter lid or stopper; whether the backing is white or yellow, which is purely about readability against your apparatus; and whether a stand (PLET-0010) or a protective case is available, because a thermometer stored loose in a drawer is a thermometer waiting to break.

Spirit against mercury against dial, on the merits

Spirit-filled thermometers use a coloured liquid, which makes them far easier to read from a distance and much the best choice for a class demonstration; they are the mercury-free option and they are cheap enough to be treated as consumable. Their limit is the upper range, which depends on the liquid used, so ask the supplier which liquid fills PLET-0008 and what accuracy it holds near the top of its stated two-hundred-degree range, since that is where this type is working hardest.

Dial thermometers contain no liquid at all, survive being dropped, and are the sensible choice for rough work, ovens and water baths. They are generally less precise and slower to respond than a glass thermometer, and they must be immersed to the marked depth on the stem. Ask the range, the stem length and the accuracy class, none of which the listing states.

For the high ranges, rather than ordering a 360-degree mercury thermometer, ask about a thermocouple or platinum resistance thermometer with a digital indicator. It reads faster, it can be logged, there is no glass to break and no mercury to account for, and for most high-temperature school work it is now the ordinary choice rather than the expensive one.

The two special instruments, and the clinical pair

Maximum and minimum (PLET-0013, PLET-0014). A Six's pattern thermometer records the extremes reached since it was last reset, with two indices pushed along the tube and left behind. Ask how the indices are reset, which is normally with a small magnet, and whether that magnet is supplied, because without it the instrument records one pair of readings and then nothing. The two codes carry the same name, so ask what differs.

Wet and dry (PLET-0026, PLET-0027). A Mason's hygrometer gives relative humidity from the difference between two thermometers, one with a wetted wick. Three things must come with it or the reading is meaningless: a wick, distilled water, because tap water leaves deposits that stop the wick drawing within weeks, and the psychrometric table or slide chart that converts the depression into humidity. Ask whether the wick, spare wicks and the table are supplied, and note that the reading also depends on air movement past the wet bulb, so the instrument should not be read in a still cupboard.

Clinical thermometers (PLET-0001, PLET-0002). These are medical devices rather than laboratory instruments. If they are intended for taking anybody's temperature, that brings regulatory obligations in the destination market and the mercury question above applies with particular force, since mercury clinical thermometers are prohibited in many countries. For a school, a digital clinical thermometer is the straightforward answer. Ask what these two codes are intended for before including them in an order.

Also worth confirming

Quote the code rather than the name. Two codes in this listing carry the same name as each other, two more differ only in that one ends in a stray "-2", two maximum-and-minimum entries appear truncated, one name is in capitals, the apostrophes are missing from Six's and Mason's, one code is qualified by what appears to be another manufacturer's pattern name, and an item of connecting leads (E-0120) is filed in this listing by mistake. Ask also for the quantity per student group, breakage spares, packing, and the warranty position on glassware. Any range or accuracy figure quoted is confirmed in writing on the quotation; ask for its basis, and ask for the mercury position in writing on every code you order.

Related ranges on this site

Calorimetry, expansion and engine apparatus, which is where most of these thermometers are used, is under Heat and Engine Physics Lab Equipments. Pressure instruments, where the same mercury question arises, are under Fluid Mechanics Physics Equipments. Weighing is under Lab Balances and Scales, and general mechanics apparatus under Mechanics Physics Lab. Parent range: Physics Lab Equipments.

Request a quote

State the ranges you need and ask for mercury-free instruments wherever the range allows. For example Red Spirit Filled minus 10 to 110 Celsius (PLET-0007), thirty off, with the immersion type, the scale division and the tolerance stated, plus one calibrated reference thermometer for the laboratory. Contact Ray Export for prices, ranges and lead times.

Frequently asked questions

Which thermometers on this listing are mercury-free?

The spirit-filled thermometers, PLET-0006 to PLET-0009, in red or blue, with ranges from minus 10 to 50, 110, 150 and 200 degrees Celsius, and the bimetallic dial thermometers PLET-0003 and PLET-0004, which contain no liquid at all. The mercury-in-glass thermometers PLET-0016 to PLET-0025 and the two maximum-and-minimum instruments carry mercury in their names. The clinical thermometers PLET-0001 and PLET-0002 do not state their filling, so ask in writing which codes are mercury-filled, including any whose names do not say so, before you order.

Can mercury thermometers be imported into my country?

Check your own import rules before ordering, not after the consignment is on the water. Mercury thermometers are named in the international agreement that phases out mercury-added products, India is party to it, and many importing countries now enforce the restriction at the border - a refused shipment is the buyer's loss. Mercury clinical thermometers are already prohibited in a great many markets. Specify mercury-free wherever the measurement allows it, which for school work is almost everywhere, and ask for the mercury position in writing on every code you order.

What should I use above 200 degrees Celsius if I want to avoid mercury?

In this listing the higher ranges, to 250 and 360 degrees Celsius, are offered only as mercury-in-glass. Rather than ordering a 360-degree mercury thermometer, ask about a thermocouple or platinum resistance thermometer with a digital indicator: it reads faster, it can be logged, there is no glass to break and no mercury to account for, and for most high-temperature school work it is now the ordinary choice. If you rely on the spirit thermometer PLET-0008 near the top of its 200-degree range, ask which liquid fills it and what accuracy it holds there, since that is where it works hardest.

Why do two students get different readings from the same thermometer?

Usually immersion depth. A liquid-in-glass thermometer is made either for total immersion, with the whole liquid column in the medium, or for partial immersion to a marked depth, and reading it with more or less of the stem immersed than intended gives a wrong answer that no care with eye position corrects. Ask, for every code, whether it is total or partial immersion and to what depth, and put that depth in the practical instructions. Ask too the smallest scale division and the stated tolerance - a one-degree division is not the same as one-degree accuracy.

What must come with the wet-and-dry hygrometer and the maximum-and-minimum thermometer?

For the Mason's pattern wet-and-dry hygrometer (PLET-0026, PLET-0027): a wick and spare wicks, distilled water - tap water leaves deposits that stop the wick drawing within weeks - and the psychrometric table or slide chart that converts the wet-bulb depression into humidity; read it in moving air, not a still cupboard. For the Six's pattern maximum-and-minimum thermometer (PLET-0013, PLET-0014): the small magnet normally used to reset the indices, without which it records one pair of readings and then nothing. The two maximum-and-minimum codes carry the same name, so ask what differs.

Should a school order the clinical thermometers PLET-0001 and PLET-0002?

Ask what they are intended for first. Clinical thermometers are medical devices rather than laboratory instruments, and if they are for taking anybody's temperature that brings regulatory obligations in the destination market. Their filling is not stated, and mercury clinical thermometers are prohibited in many countries, so the mercury question applies to them with particular force. For a school, a digital clinical thermometer is the straightforward answer. If these two codes are still wanted, ask the filling and the intended use in writing before including them in any order.

Key takeaways

• Decide the filling before the range - spirit (PLET-0006 to PLET-0009) and dial (PLET-0003, PLET-0004) cover most school work without mercury.
• Check import rules before ordering - many countries now refuse mercury thermometers at the border.
• Above the spirit range, go digital - a thermocouple or platinum resistance thermometer rather than a 250 or 360-degree mercury instrument.
• Immersion depth decides whether a reading is right - ask total or partial, and to what depth, for every code.
• Keep one calibrated reference thermometer for calorimetry, band-gap or Planck constant work, and check the others against it.
• Never sweep or vacuum a mercury spill - ventilate and vacate, use the proper absorbent kit, and dispose of old stock through a licensed route.

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 - filling, range, immersion type and depth, scale division, tolerance, overall length and stem diameter - are confirmed in writing on the quotation, together with the mercury position for every code. For calibration certificates, standards or approvals, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing notes: two codes carry the same name as each other and two more differ only by a stray -2; two maximum-and-minimum entries appear truncated; one name is in capitals; the apostrophes are missing from Six's and Mason's; one code is qualified by what appears to be another manufacturer's pattern name; a connecting-leads item (E-0120) is filed here by mistake; the dial thermometer ranges and the clinical thermometer filling are not stated; and PLET-0005 and PLET-0015 do not appear in the range table.