RH Systems

What RH Systems does

RH Systems is a privately-held U.S. manufacturer founded in 1998 by Bob Hardy, specializing in precision humidity and temperature generation and measurement instruments for national metrology institutes, accredited calibration laboratories, and industrial buyers. The company is headquartered in Gilbert, Arizona (relocated from Albuquerque, NM in 2017) and has grown from a one-person operation to over 25 employees through entirely organic, bootstrapped growth with no external institutional capital.

The product portfolio centers on humidity generators (the CGS-240, G2, and the flagship G3 Frost Point Humidity Generator, which achieves humidity concentrations below 1 PPB via vacuum-chamber-encapsulated two-pressure/two-temperature architecture with Free-Piston Stirling Coolers), chilled mirror hygrometers (the 373, 473, 973 dew point mirrors and the 2025-launched Duet with proprietary FrostLock technology), the PT12 precision thermometer, and the 973-SF6 gas analyzer for electrical power infrastructure. RH Systems operates an NVLAP ISO 17025-accredited calibration laboratory (Code 600161-0) providing accredited humidity calibration services on customer-owned instruments. Founder Bob Hardy is the primary author of RISP-5, the industry specification for humidity measurement.

RH Systems sells exclusively through direct enterprise sales, with quote-based pricing, multi-year support contracts, and 20+ year instrument operational lifespans. The customer base spans government and national metrology institutes (Sandia National Labs), pharmaceutical firms (Haleon), and industrial sensing companies, with vertical extensions into SF6 gas-insulated switchgear monitoring for utilities and aerospace/defense applications. The company maintains an active content-marketing and trade-show presence across NCSLI, Sensor+Test, IEEE PES T&D, A2LA, and Tempmeko/ISHM conferences in the US and Europe.

Name

RH Systems

Legal name

RH Systems

Website

https://rhs.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

11–50 employees

Short description

RH Systems designs and manufactures precision humidity and temperature generators, chilled mirror hygrometers, and SF6 gas analyzers for national metrology institutes, accredited calibration laboratories, and industrial buyers, selling exclusively via direct enterprise sales with NVLAP-accredited calibration services.

Ownership category

akta.pro rank

Product category

Precision Humidity and Temperature Calibration Instruments

NAICS

Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

Laboratory Analytical Instruments (3826)

akta.pro primary industry

Metering Equipment Testing, Calibration & Certification (EUAJAKAA)

Keywords

• Humidity generation systems
• Dew point measurement
• Precision calibration instruments
• Two-pressure humidity generators
• Chilled mirror hygrometers

Headquarters

HQ city

Gilbert

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Technology or R&D, Supply Chain, Marketing or Sales, Infrastructure, Others

Revenue model

1. Precision Instrumentation Sales: Sale of humidity generators, chilled mirror hygrometers, dew point mirrors, precision thermometers, and SF6 gas analyzers. Products are high-value capital equipment sold directly to calibration laboratories, metrology institutes, and industrial customers with multi-year operational lifespans and 20+ year support commitment.
2. Calibration Services: NVLAP-accredited laboratory calibration services utilizing the speed and reliability of Two-Pressure, Two-Temperature humidity generators for expedient turn-around. Expert technical staff service customer-owned standards.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

RH Systems designs, engineers, and manufactures high-precision humidity generators, chilled-mirror and dew point hygrometers, precision thermometers, and SF6 gas analyzers used to generate and measure humidity and temperature reference standards. The company also operates an NVLAP ISO 17025-accredited laboratory providing calibration services for customer-owned humidity and temperature standards, supporting national metrology institutes, commercial calibration laboratories, and industrial customers worldwide.

Product overview

RH Systems provides precision humidity and temperature measurement and calibration solutions for metrology institutes, calibration laboratories, and industrial applications. Their product portfolio centers on humidity generation products (CGS-240, G2, and G3 Frost Point humidity generators), humidity measurement instruments (373, 473, and 973 Dew Point Mirrors, plus the Duet Chilled Mirror Hygrometer), temperature measurement (PT12 Precision Thermometer), and SF6 gas analysis (973-SF6 Gas Analyzer). The company also provides NVLAP-accredited calibration services using their proprietary humidity generators. Products are manufactured in the USA (Arizona) and backed by 25 years of innovation.

Differentiator

Problem solved

Functional benefit

Brands

• FrostLock: Proprietary technology in the Duet Chilled Mirror Hygrometer that addresses dew-frost ambiguity in subzero hygrometry by reliably distinguishing between dew and frost on the mirror surface

Products and services

• G3 Frost Point Humidity Generator Low frost point humidity generator that achieves ultra-dry conditions below 1 PPB using dual CFC-free cryocoolers, vacuum chamber thermal isolation, and Free-Piston Stirling Coolers. Provides up to three independent flow-controlled outputs and is used by national metrology institutes and calibration laboratories for the most demanding primary standards work.
• CGS-240 Humidity Generator Two-pressure, two-temperature humidity generator with independent control of saturated air generator and chamber temperature, six-sided thermal regulation, full-color touchscreen interface, modular design for field repairs, and integrated air drying system. Used in metrology, calibration, and military/aerospace humidity applications.
• G2 Humidity Generator Two-pressure humidity generator for calibration and testing applications requiring precise, stable humidity generation.
• The Duet Chilled Mirror Hygrometer State-of-the-art portable chilled mirror hygrometer with dual dew/frost point measurement, FrostLock dew-frost discrimination, ratiometric resistance measurement, 24-bit ADC, embedded Linux platform, and dual PRT ports in a 12 kg custom Pelican case. Designed, engineered, and built entirely in-house.
• 373 Dew Point Mirror Precision dew point mirror hygrometer for high-accuracy humidity measurement in calibration and laboratory environments.
• 473 Dew Point Mirror Precision dew point mirror hygrometer for high-accuracy humidity measurement in calibration and laboratory environments.
• 973 Dew Point Mirror Precision dew point mirror hygrometer for high-accuracy humidity measurement in calibration and laboratory environments.
• PT12 Precision Thermometer Multi-channel precision thermometer delivering high-accuracy temperature measurement for metrology and laboratory use.
• 973-SF6 Gas Analyzer Specialized gas analyzer for SF6 (sulfur hexafluoride) measurement in gas-insulated electrical equipment. Monitors humidity, pressure, and gas purity for power utility substation maintenance.
• Calibration Services NVLAP ISO 17025-accredited laboratory calibration services using RH Systems' Two-Pressure, Two-Temperature humidity generators for expedient turn-around of customer-owned humidity and temperature standards.

Quantifiable outcome

• Humidity concentration below 1 PPB achieved with G3 Frost Point Generator
• +4 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Ametek: Diversified electronic instruments and electromechanical manufacturer with calibration and process measurement business lines (including Jofra and Land Instruments) that serve adjacent customers and competitors with humidity and temperature calibration solutions.
• Vaisala: Public Finnish leader in humidity, dew point, and CO2 measurement instruments with deep installed base across industrial and metrology segments. The dominant incumbent in most humidity measurement categories, offering broader portfolio and global distribution than RH Systems.
• WIKA: Global manufacturer of industrial measurement instruments for pressure, temperature, and humidity with broad distribution. Competes with RH Systems for industrial humidity calibration and process measurement budgets across international accounts.
• testo: German manufacturer of portable humidity, temperature, and emissions measurement instruments with a broader portfolio than RH Systems. Directly competes for industrial and HVAC-adjacent humidity measurement buyers globally.
• Fluke Calibration: Division of Fluke Corporation producing temperature, pressure, and humidity calibration standards for laboratories. Overlaps with RH Systems on the calibration-instrument side even though Fluke's humidity line is narrower than its electrical calibration portfolio.
• Thermo Fisher Scientific: Large analytical instrumentation and laboratory equipment supplier with extensive reach into pharmaceutical, environmental, and metrology end markets where RH Systems' precision instruments are specified. Provides a competing option at the enterprise laboratory buyer level.

Direct peers

• MBW Calibration: Swiss manufacturer of chilled mirror hygrometers and humidity generators with global NMI and accredited calibration lab customer overlap. Competes head-to-head with RH Systems in metrology-grade humidity generation and chilled mirror measurement.
• Michell Instruments: Part of Process Sensing Technologies; produces chilled mirror hygrometers, dew point transmitters, and humidity generators covering overlapping applications with RH Systems, especially in process industries and calibration laboratories.
• Thunder Scientific Corporation: US-based manufacturer of two-pressure humidity generators and chilled mirrors serving national metrology institutes and calibration laboratories. Direct competitor with overlapping products to RH Systems' G3, CGS-240, and dew point mirror lines in the same primary metrology segment.
• Rotronic: Also part of Process Sensing Technologies; specializes in humidity probes, handheld hygrometers, and data loggers that overlap with RH Systems' measurement products and compete for industrial buyer humidity measurement budgets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

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Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about RH Systems