Rotronic Humidity & Temperature Instruments, Singapore Authorised Distributor
Swiss-engineered precision humidity and temperature measurement, from handheld meters to cleanroom monitoring systems. Genuine Rotronic instruments, in Singapore, with full manufacturer warranty and calibration support from our own accredited lab.
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The little details
Swiss precision, Singapore support
Genuine Rotronic instruments, engineered in Switzerland, backed by full manufacturer warranty and a local team that knows the product line.
Calibration is where humidity measurement lives or dies
Rotronic's own HygroGen2 exists because humidity sensors drift — Unitest's SAC-SINGLAS accredited lab keeps your instruments traceable and defensible.
One vendor for the full humidity chain
Handhelds, transmitters, room monitoring, and calibration generators — plus the accredited lab that keeps all of them traceable.
Why Rotronic, and why buy it through an accredited distributor
Humidity is one of the harder things to measure honestly. Sensors drift, probes age, and a reading that's off by even a percent or two can be the difference between a cleanroom passing an audit and a batch of stock being questioned. That's the problem Rotronic, a Swiss instrument maker specialising in precision humidity and temperature measurement, has built its business around solving.
Unitest Instruments is Rotronic's authorised distributor in Singapore. In practice, that means three things a buyer should care about. First, every unit sold is genuine, factory-calibrated, and covered by Rotronic's full manufacturer warranty, not a parallel-import unit with an uncertain history. Second, Unitest holds local stock and local product knowledge, so choosing between a HygroFlex transmitter and a HygroPalm handheld doesn't have to be a guessing game done over email with a supplier overseas. Third, and most important for anyone using these instruments for regulated or audit-sensitive work, Unitest runs its own SAC-SINGLAS accredited (ISO/IEC 17025) calibration laboratory in Singapore, accreditation number LA-2023-0845-C, so the same instrument that measures your environment can also be calibrated traceably by the people who sold it to you.
That last point matters more than it sounds. A humidity instrument is only as trustworthy as its last calibration. Buying through an accredited distributor with its own accredited lab keeps that calibration chain intact under one roof, instead of splitting it across a seller who doesn't calibrate and a lab that didn't sell the instrument.
The right choice usually comes down to how you need the reading, not which industry you're in. If you're monitoring a whole room continuously across multiple points, that's what the Room Monitoring System is built for, combining transmitters and loggers into one system.
| Need | Instrument |
|---|---|
| A live, continuous reading feeding a BMS, PLC, or control system | Transmitters (HygroFlex3 / HF4 / HF5 / HF5A / HF8) |
| A spot-check reading, walked around to different points as needed | Handhelds (HygroPalm HP31 / HP32) |
| Unattended logging over time, reviewed or downloaded later | Data Loggers (HygroLog HL-1D / HL-20D) |
| Generating a known, stable humidity reference to calibrate other instruments against | Calibration Generators (HygroGen2 HG2-S / HG2-XL) |
| A probe built for wash-down or harsh conditions, not just general ambient air | HC2A-SM stainless steel probe (vs. the standard HC2A-S) |
Tell us how you need the reading, live feed, spot-check, logged, or calibration reference, and we'll recommend the model.
Featured Rotronic Products
HygroFlex3 — HF3 Transmitter
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HygroFlex4 — HF4 Universal Transmitter
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HygroFlex5 — HF5 Transmitter
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HygroFlex HF5A Advanced Transmitter
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HygroFlex8 — HF8 Transmitter
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HC2A-S Standard Ambient Air Probe
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HC2A-S3 Standard Meteo Probe
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HC2A-SM Stainless Steel Industrial Probe
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HC2A-IC102 Cable Probe, 2m
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HC2A-IC105 Cable Probe, 5m
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Rotronic in Singapore — Common Questions
Is Unitest an authorised Rotronic distributor in Singapore?
Yes. Unitest Instruments is Rotronic's authorised distributor in Singapore, supplying genuine Swiss-engineered humidity and temperature instruments with full manufacturer warranty. That's different from buying directly overseas or through an unauthorised reseller: a unit bought that way may not carry a warranty that's honoured in Singapore, and there's no local distributor behind it if you need support, spares, or calibration. Buying through Unitest means the warranty applies here, the stock is genuine, and the same team that sold you the instrument can also calibrate it.
Can Rotronic instruments be calibrated locally in Singapore?
Yes. Unitest runs its own SAC-SINGLAS accredited (ISO/IEC 17025) calibration laboratory, accreditation number LA-2023-0845-C, and regularly calibrates Rotronic humidity and temperature instruments traceably.
What Rotronic instruments does Unitest carry?
Handheld meters (HygroPalm), transmitters (HygroFlex), industrial probes (HC2A series), data loggers (HygroLog), room monitoring systems (RMS), HygroGen2 calibration generators, and water activity meters.
What's the difference between the HC2A-S and HC2A-SM probes?
The HC2A-S is the standard probe for general ambient air measurement. The HC2A-SM is the stainless steel version, built for harsher conditions such as wash-down environments or where the probe needs a more rugged housing than general ambient use calls for. Which one you need depends on the physical conditions the probe will sit in, not the reading itself.
Do I need a HygroFlex transmitter or can I use a HygroPalm handheld?
A HygroFlex transmitter gives a live, continuous reading you can feed into a building management system, PLC, or monitoring setup. A HygroPalm handheld is for spot-checks, walked around to different points as needed rather than fixed in one location. If you need continuous, unattended monitoring, a transmitter is the right fit; if you're checking multiple locations periodically, a handheld does the job without installing fixed hardware everywhere.
Can Unitest calibrate Rotronic instruments traceably for audit purposes?
Yes. Unitest operates its own SAC-SINGLAS accredited (ISO/IEC 17025) calibration laboratory in Singapore, accreditation number LA-2023-0845-C, and regularly calibrates Rotronic humidity and temperature instruments traceably, with certificates suitable for audit use.
What is the Room Monitoring System (RMS) and do I need it?
The Room Monitoring System (RMS) is Rotronic's setup for continuously monitoring humidity and temperature across multiple points in a room or facility, using wall-mounted loggers, a gateway, and a display, rather than a single fixed transmitter. You'd need it if you're monitoring more than one point at once, want a centralised view across a room or building, or need continuous records for audit and compliance purposes. If you only need one point measured continuously, a single HygroFlex transmitter may be enough on its own.
Not sure which Rotronic instrument fits your application?
Cleanroom, cold chain, HVAC, or lab — tell us the environment and we'll recommend the right model.