Rapid field screening
Obtain useful fluid-property measurements where the decision must be made, without waiting for an initial laboratory report.
Portable on-site fluid analysis
RapidX Diesel Fuel and Oil Tester
Measure viscosity, density and temperature within seconds. The Yateks ViscoPen gives maintenance and fuel-management teams a practical way to screen diesel fuel, lubricants and industrial fluids directly in the field.
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Fast on-site fluid screening
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Three important measurements
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One-button operation
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Compact rechargeable design
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One portable instrument for viscosity, density and
temperature measurement.
Within Seconds
Rapid field measurements
IP67 Probe
Industrial measuring end
35+ Hours
Rechargeable operating time
250 g
Compact handheld format
Test before the fluid is used
Make faster fuel and lubricant decisions on site
A questionable diesel delivery or an abnormal lubricant condition can expose valuable equipment to avoidable risk. Appearance and smell alone cannot provide reliable information about a fluid’s physical properties.
The RapidX Diesel Fuel and Oil Tester provides immediate viscosity, density and temperature measurements at the point of delivery, storage, transfer or maintenance. This allows personnel to compare the sample with a known good reference before the fluid enters critical equipment.
The result is a faster first-line screening process and a clearer basis for deciding whether the fluid should be accepted, isolated or sent for further laboratory analysis.
Key product benefits
Practical fluid testing without unnecessary complexity
A portable first-line tool for fuel control, maintenance, reliability and condition-monitoring teams.
Multi-parameter testing
Measure viscosity, density and temperature using one compact handheld instrument.
Simple operation
The one-button design supports fast routine use by field, workshop and maintenance personnel.
Industrial probe
A 316 stainless-steel measuring probe with an IP67 protection rating supports demanding applications.
Rechargeable battery
USB-C charging and more than 35 hours of stated operating time support extended field use.
Portable format
At approximately 250 grams, the ViscoPen is easy to carry between storage tanks, workshops and operating sites.
What RapidX measures
Three measurements for faster fluid screening
Compare the results with an approved reference sample, expected product specification or historical readings.
Viscosity
Measures a fluid’s resistance to flow. An abnormal result may indicate a change in grade, condition, temperature or composition.
Density
Measures mass per unit volume. Density comparison can help identify meaningful differences between a sample and a known reference fluid.
Temperature
Records fluid temperature because temperature directly influences viscosity and must be considered when results are evaluated.
Suitable for organisations that purchase, store, transfer
or use diesel fuel and industrial lubricants.
Industrial applications
Use RapidX where fluid quality affects operational reliability
The portable tester is suited to businesses that need a fast screening tool for diesel fuel, lubricating oils and compatible industrial fluids.
Mining operations
Transport fleets
Fuel storage facilities
Power generation
Agriculture
Construction equipment
Industrial plants
Maintenance workshops
Measurement capabilities
RapidX ViscoPen measurement ranges
Published ranges and accuracy figures for the Yateks ViscoPen portable fluid analyser.
| Parameter | Measurement range | Stated accuracy |
|---|---|---|
| Temperature | 0–60°C | ±0.3°C |
| Density | 600–1250 kg/m³ | ±3% |
| Dynamic viscosity | 1–1000 mPa·s (cP) | ±5% |
| Kinematic viscosity | 1–1000 mm²/s (cSt) | ±5% |
| Viscosity at 40°C | 1–1000 cSt | ±5% to ±8% |
| Viscosity at 100°C | 1–1000 cSt | ±5% to ±8% |
Accuracy note:
Published accuracy is based on averaged static measurements in a
laboratory environment. Sampling method, fluid movement,
temperature and other field conditions may influence individual
results.
Straightforward field use
A simple three-step screening process
Build repeatable testing into fuel receiving, fluid transfer and maintenance procedures.
Prepare the sample
Collect a representative fluid sample in a clean, compatible container and ensure the probe can be immersed to the indicated measuring level.
Take the reading
Insert the measuring end into the fluid and activate the instrument using the operation button.
Compare the result
Compare the displayed values with a known good sample, product specification or historical baseline before deciding on the next action.
Technical information
RapidX product specifications
Operating temperature
0–50°C
Supported fluid temperature
0–60°C
Storage temperature
0–55°C
Instrument body protection
IP5X
Probe protection
IP67
Probe material
316 stainless steel
Battery capacity
3450 mAh
Operating time
More than 35 hours
Charging connection
USB-C
Instrument weight
250 g
Local product support
More than a handheld instrument
ISO-Reliability Partners supports customers with application guidance focused on fluid cleanliness, condition monitoring, diesel filtration and industrial equipment reliability.
The correct testing procedure, reference fluid and interpretation limits should be established for the customer’s specific fuel or lubricant application.
Frequently asked questions
RapidX Diesel Fuel and Oil Tester FAQ
What does the RapidX Diesel Fuel and Oil Tester measure?
RapidX measures temperature, density, dynamic viscosity and kinematic viscosity. It also provides viscosity readings referenced to 40°C and 100°C.
Can RapidX identify paraffin adulteration in diesel?
RapidX can flag abnormal viscosity and density readings that may be consistent with a change in diesel composition. Results should be compared with a known good reference sample. Laboratory testing is recommended when formal confirmation is required.
How quickly does the instrument provide a reading?
The ViscoPen is designed to provide viscosity, density and temperature measurements within seconds.
Can RapidX test lubricating oil?
Yes. The instrument is intended for diesel fuel, lubricants and compatible industrial fluids that fall within its published measurement ranges.
Does RapidX replace laboratory fluid analysis?
No. RapidX provides rapid on-site screening and condition information. Laboratory analysis remains appropriate for detailed contamination analysis, forensic identification, certification or formal contractual evidence.
Who can benefit from using the RapidX ViscoPen?
Fuel managers, reliability teams, fleet operators, mines, farms, workshops, industrial plants, generator operators and businesses that receive or store diesel fuel can use RapidX as part of a fluid-quality control process.
Request product information
Strengthen your on-site diesel and lubricant quality checks
Contact ISO-Reliability Partners for RapidX pricing, availability and guidance on incorporating portable fluid screening into your reliability programme.