Rudolph Research Handheld Instruments: J27 & DDM 29 for Precision and Portability
Laboratory Accuracy Everywhere you need to measure
Rudolph Research’s J27 and DDM 29 handheld instruments offer laboratory level precision for field, stockroom, and lab use. Featuring high-resolution digital displays, these tools provide accurate readings in real time.
Their durable, ergonomic designs make them ideal for tough environments, while the user-friendly interface simplifies complex measurements, reducing errors.
With minimal maintenance, they are a cost-effective choice for industries like food, pharmaceuticals, and chemicals, ensuring consistent quality control through fast, reliable measurements.
Key Features:
• Game changing, temperature control results in higher accuracies and no measurement drift
• Precise readings via high-resolution displays
• Durable & portable for rugged conditions
• User-friendly interface reduces errors
• Long life swapable batteries keep you running all day
• Low maintenance, ensuring consistent performance
• Reduce the work load on your busy labs
Whether measuring refractive index or density, these instruments blend cutting-edge technology with handheld convenience
Laboratory Accuracy Everywhere You Need to Measure
Unmatched Capabilities in a Fully Portable Density Meter
Temperature Controlled Measurements at 20° and 25°C
The problem with most handheld Density Meters is they drift because they do not control temperature. Density Meter measurements are highly sensitive to temperature and mathematically correcting for temperature may not be good enough for some applications. Only temperature control will result in the accuracy many users require.
The Rudolph DDM 29 utilizes powerful and compact Peltier technology. Control of the sample temperature for precise heating and cooling to ensure stable and accurate measurements at either 20 or 25°C.
Rugged Stainless Steel Double U-Tube for unmatched accuracy, durability, and weight reduction
The Rudolph DDM29 uses a 316 Stainless Steel, Double U-Tube instead of a simple glass U-Tube. This new design is durable and corrosion resistant. Stainless Steel is preferable for customers who are tired of replacing glass U-Tubes in other handheld brands.
The Double U-Tube design allows for handheld accuracy and rapid measurement speed. Demonstrating 3 decimal place measurement readings in 30 seconds, and 4 decimal measurements in 60 seconds.
User friendly GUI and Bright, Back Lit,Touch Screen Display
Extremely easy to use Graphic User Interface (GUI) and the availability of 10 different Languages on a brightly lit 7 inch(128mm) touch screen makes this the most User Friendly Density Meter in the market today. The interface is a bright LED touchscreen, with a large easy to navigate GUI. No more difficulties reading measurements in bright or dark environments.
Portability and Flexibility
TheDDM29 is powered by a Lithium-Ion battery that is easily recharged, your DDM29 is ready to go everywhere you need to make measurements. This might be at the loading dock when receiving incoming raw goods or out on a distillery floor. The Lithium Ion battery can be charged in approximately 2 hours providing up to 4 hours of constant measurements under heavy usage or 8 hours of normal usage. Included is a Charging Station for convenient stationary charging.
Laboratory Accuracy – Everywhere You Need to Measure
Most Handheld Density Meters use temperature correction and publish 2 or 3 digit accuracy which is very prone to drift. The DDM29 uses Peltier Temperature Control, which eliminates drift and provides accuracy to the 4th decimal place. Laboratory accuracy in the DDM29 reduces testing of materials in the main Lab. Testing can now be done accurately in the receiving dock, formulations area, or where ever measurements are needed.
Flexible Method Management
Factory installed measurement methods cover a wide group of industries and applications. The DDM29 is factory configured with over 50 density and concentration tables, such as Brix, %Alcohol, API, and most common chemicals. Additional tables, polynomials, and formulas may be added.
- Essential Oils
- Chemicals
- Beer, wort, and fermentation monitoring
- Raw material soft drink monitoring
- Monomers, Polymers and Elastometers
- Pharmaceutical raw materials and finished products
- Wort, juice, fermentation, spirits safe monitoring
- Blending, bottling, spirits and liquors packaging
- Sulfuric Acid in lead-acid batteries
- Adhesives, glues
- Agriculture, chemicals and fertilizers
- Colloids, nanotechnology
- Surfactants, detergents
- Emulsions
- Paints, Inks, Toners
- Organic, inorganic chemicals
- Fuel cells, power generation, sustainable fuels
- Soft drinks, juices, tea, coffee
- Petroleum samples according to ASTM methods
A measurement method is created exactly for unique measurement applications. You may use Concentration Tables, Formulas and Polynomials to match the measurement methods used in your laboratory or field application.
Industry Applications For Handheld Density Meters
Technical Specifications
DDM29 Handheld Density Meter
| Accuracy | Density: 0.0001 g/cm3* | Temperature: 0.05 °C |
| Repeatability (Standard Deviation) | Density: 0.0001 g/cm3 Temperature: 0.02 °C |
| Resolution | Density: 0.0001 g/cm3 Temperature: 0.01°C |
| Temperature Selectable | 20 or 25 °C ±0.01°C |
| Temperature Control (Controlled via Peltier) | 20 or 25°C. Selectable up to 0.001°C |
| Ambient Temperature | -10 to + 55°C |
| % Concentration Scales | Unlimited |
| Ambient Temperature Limit | 0 to 35°C |
| Pressure Range | 0 to 10 bar (145 psi ) |
| Measurement Modes | Continuous, Single, Multiple |
| Measurement Technique | Mechanical Oscillating Double U-Tube Method |
| Measurement Range | Density: 0-3g / cm3 |
| Minimum Sample Volume | Approx 1mL |
| Wetted Materials | 316 Stainless steel, Teflon PTFE, ECTFE, PVDF |
| Supported scales | Density, Specific Gravity, Alcohol Tables, Sugar/Extract, API functions, H2SO4 tables, acids, bases, organic and inorganic chemicals |
| Operating System | Android OS |
| Measurement Time | Typically 30 – 40 seconds after thermal equilibration |
| Display | Bright LED – 7” touch screen. |
| Communication Interfaces | USB-C, WiFi, Bluetooth® –Manual Entry, RFID, and Barcode for entering sample IDs are all Standard |
| Printing | Wireless Printing Via Airprint |
| Remote Support | Troubleshooting, Diagnostics Tools, Software Updates available via the Internet |
| Internal Memory | Up to 3,000 Measurements |
| Operating Dimensions | 7.28” (L) x 4.83” (W) x 13.59” (H) 18.49 cm (L) x 12.27 cm (W) x 34.52 cm (H) |
| Shipping Dimensions | 18” (L) x 18” (W) x 12” (H) |
| Operating Weight | 3lbs 6oz |
| Charging /Power Consumption | 2 hours charging provides up to 4 hours of measurements in heavy usage or 8 hours under normal usage. |
| Included with Instrument | Charging station, syringes, instructions |
| Protection Class | IP54 |
| Country of Manufacture and Design / Warranty | 1 Year Domestic and international warranty |
Unmatched Capabilities in a Fully Portable Refractometer
Rudolph brings decades of leadership with High Accuracy, Bench top Refractometers to Handheld Instrumentation
With the experience and innovation gained from over 2 decades of leadership in Refractometer design and manufacturing, Rudolph introduces the new benchmark for Handheld Refractometers. The J27 Refractometer is entirely untethered yet refuses to accept the compromises in performance and accuracy of typical Handheld instruments. Now measure everything anywhere still with laboratory level accuracy
Temperature Controlled Measurements at 20 and 25°C
The weakness of most handheld Refractometers is they do not control temperature. Refractometer measurements are often highly sensitive to drifting results because mathematically correcting for temperature alone does not work well when the ambient temperature is changing. Only precise temperature control will result in the measurement accuracy many users require.
The Rudolph J27 Peltier Temperature Control at the prism surface allows for improved accuracy and greater stability. Precise heating and cooling ensures stable and accurate measurements at either 20 or 25°C. Select the J27 series with temperature control for precise measurements when working with samples that are very hot, very cold or are not Sucrose, Glucose or sugar based.
For example, a glycol sample must be measured with precise temperature control for an accurate measurement – temperature correction for sugar cannot be applied to non-sucrose based samples. A sample coming from a hot kettle on a production line must also be temperature controlled as temperature correction will not be accurate for a sample far from room temperature.
High Durability Industrial Sapphire Prism
Synthetic sapphire prisms have similar hardness to diamond and can be cleaned with a paper towel. This makes sample cleaning fast and easy.
Regardless of an instrument’s specified accuracy, a refractometer’s real-world performance depends on how well the instrument is cleaned between samples.
User friendly GUI and Bright LED, Touch Screen Display
Extremely easy to use Graphic User Interface (GUI) and the availability of 10 different Languages on a brightly lit 7 inch (178mm) touch screen makes this the most user friendly Refractometer on the market today.
The interface is a bright, LED touchscreen, with an easy to navigate GUI. No more difficulties reading measurements in very bright or dark environments in the warehouse or field.
Portability and Flexibility
The J27 is powered by a Lithium-Ion battery that is easily recharged, your J27 is ready to go everywhere you need to make measurements. This might be at the loading dock when receiving incoming raw goods or out on a distillery floor. The Lithium Ion battery can be charged in
approximately 2 hours providing up to 4 hours of
constant measurements under heavy usage or 8 hours of normal usage. Included is a Charging Station for convenient stationary charging.
Laboratory Accuracy – Everywhere You Need to Measure
Most handheld Refractometers only provide for 2 or 3 decimal place accuracy and results are prone to drift. By combining laboratory level measurement module design, and true Peltier Temperature Control, Rudolph provides accuracy to the 4th decimal place. Laboratory accuracy in the field eliminates rechecking of materials in the Lab allowing users to test right in the field, on the receiving dock, or in a formulations area. Materials are measured for a reason, so why settle for just 2 or 3 decimal place accuracy when you can have steady and reliable 4 decimal place accuracy?
Flexible Method Management
Factory installed measurement methods and scales cover a wide group of industries and applications. The J27 is factory configured with over 20 Methods and Concentration Scales which include RI, Brix, Urine SG, and more. Users can create measurement methods and store any scale they wish.
Food and Beverage Applications
•Seed Oils
•Edible Oils
•Candy
•Syrups
•Soups
•Milk
•Teas
•Juices
•HFCS
•Soft Drinks
•Sauces
•Confections
•Jellies
•Fruit products
•Soybean Oil
•Sodas
•Jams
•Starch
•Coffee Extracts
•Juice concentrates
•Vegetable Products
Market Specific Scales Available
- Urine Specific Gravity
- Fuel System Icing Inhibitor
- Ethylene Glycol / Coolant
- Alcohol
- Nitric Acid
- Coffee
- UAN Fertilizer
- Ethanol
- Formaldehyde
- Glycerol
- Methanol
- Potassium Chloride
- H2O2
- Propylene Glycol
- Propanol
- Baume
- Calcium Chloride
- Urea
- Sodium Chloride
Technical Specifications J27 Handheld Refractometer
| Measurement Range | RI 1.3 -1.7, Brix 0-100 |
| Accuracy | RI ±0.0001, Brix ±0.05 |
| Repeatability | RI ±0.0001, Brix ±0.05 |
| Resolution | RI 0.0001 – Brix 0.01 |
| Temperature Control | 20 or 25 °C |
| Measurement Scales | Refractive Index (nD), Brix (% Sucrose)(% RDS) |
| % Concentration Scales | Unlimited |
| Ambient Temperature Limit | 0 to 35°C |
| Sample Dish | Easy Clean, Small Volume, Sample Dish |
| EP Cover | Standard |
| Prism | Synthetic Sapphire |
| Operating System | Android OS |
| Measurement Time | User Configurable – can be less than 5 seconds |
| Display | Bright, Backlit – 7” touch screen. Standard 10 different Language options |
| Data Storage | Internal Storage holds up to 3,000 measurements |
| Communication Interfaces | USB-C, WiFi, Bluetooth®, Manual Entry, RFID, and Barcode Reader for entering sample IDs |
| Printing | Wireless |
| Remote Support | Troubleshooting, Diagnostics Tools, Software and Updates available via the Internet |
| Internal Memory | Up to 3,000 Measurements |
| Operating Dimensions | 7.28” (L) x 4.83” (W) x 13.59” (H) 18.49 cm (L) x 12.27 cm (W) x 34.52 cm (H) |
| Shipping Dimensions | 18” (L) x 18” (W) x 12” (H) |
| Operating Weight | 3 lbs 6oz |
| Charging /Power Consumption | 2 hours charging provides up to 4 hours of measurements in heavy usage or 8 hours of normal use. |
| Country of Manufacture and Design / Warranty | 1 Year Domestic and international warranty |
