The PCE-WAT 10 Water Activity Meter is a portable water activity analyzer designed for routine food QA/QC, shelf-life studies, product development, pharmaceutical testing, feed production, chemical applications and laboratory research.
It measures water activity from 0.00 to 1.00 aw with 0.01 aw resolution and ±0.02 aw accuracy, while simultaneously displaying sample temperature.
With an approximately 5-minute measurement rate, internal storage for up to 99 results, a backlit LCD and battery-powered operation, the PCE-WAT 10 is a practical choice for laboratories and production QA teams that need straightforward routine water activity testing without moving to a higher-cost multi-channel or high-resolution system.
Water activity (aw) describes how much water in a product is available to participate in microbial growth, chemical reactions and other stability-related processes.
Water activity is expressed on a scale from approximately 0.00 to 1.00 aw, where pure water is approximately 1.00 aw under defined conditions.
Water activity is particularly important in food and ingredient testing because two products can contain a similar amount of total moisture while having very different amounts of water available for microbial growth or chemical activity.
Moisture content measures the total amount of water in a product.
Water activity measures the availability or energy state of that water. This makes water activity especially useful when evaluating microbial stability, formulation behaviour and shelf-life performance.
Water activity is an important intrinsic property in food formulation and shelf-life assessment because microorganisms require available water to grow.
Monitoring aw can help food manufacturers evaluate:
Water activity should be considered together with other product characteristics such as pH, formulation, processing, packaging, temperature and storage conditions when evaluating shelf life or food safety.
Water activity values around 0.85 aw are frequently discussed in food-safety applications because most foodborne pathogens do not grow below this level.
However, 0.85 aw should not be treated as a universal pass/fail shelf-life limit. Yeasts and moulds can tolerate lower water activity, and the appropriate specification depends on the product, organism of concern, formulation, process and applicable regulatory or validated method.
The PCE-WAT 10 is particularly well suited to Canadian food manufacturers that need routine water activity measurements without the cost or complexity of a high-resolution laboratory system.
Potential applications include:
A product-specific water activity specification should be established through your validated formulation, shelf-life study, regulatory requirements or quality-control program rather than using one universal target for every product.
Water activity can be useful during product development because changes to ingredients such as salt, sugar, humectants or water, as well as drying and processing conditions, can change the amount of water available within the finished product.
The PCE-WAT 10 can therefore support comparison of:
Water activity is one factor in shelf-life assessment and should not be used by itself to establish a best-before date without appropriate product-specific validation.
The PCE-WAT 10 can also be used for suitable grain, seed, feed, powdered agricultural products and other dry or semi-dry samples.
Water activity can provide information about the availability of moisture within these materials and can complement conventional moisture-content testing when evaluating storage behaviour or product stability.
Water activity can also be relevant to suitable pharmaceutical, natural health product and cosmetic formulations where available water may affect microbial stability or other quality attributes.
Examples may include powders, tablets, dry formulations, creams or other products where a validated water activity specification has been established.
Regulatory or compendial applications should always follow the method, accuracy, calibration and documentation requirements specified by the applicable quality system.
PCE identifies the PCE-WAT 10 for measurement of a variety of sample forms, including:
The sample should be representative of the product and placed in the sample dish so that the measurement chamber can be properly closed without contaminating the sensor.
Consistent sample preparation is essential for comparable water activity results.
For routine measurements:
Water activity changes with temperature. For meaningful comparisons, samples and reference standards should be measured under stable and comparable temperature conditions. Avoid moving a cold sample directly from refrigeration into the meter and immediately comparing it with a room-temperature standard.
PCE specifies an approximately 5-minute measurement rate for the PCE-WAT 10.
This makes it useful for routine QA/QC environments where multiple ingredient or finished-product samples must be checked during a production shift.
Measurement consistency still depends on correct sample preparation and stable measurement conditions.
The PCE-WAT 10 can store up to 99 measurement records internally.
This allows operators to review recent results without manually recording every measurement immediately after a test.
For laboratories requiring substantially larger data libraries, multi-channel testing, higher resolution or advanced data-management functions, Cambridge also offers higher-performance water activity systems.
The PCE-WAT 10 has a published water activity accuracy of ±0.02 aw.
This means a small difference between a known reference standard and the displayed result does not automatically indicate a faulty meter.
For example, if a 0.760 aw standard displays 0.77 aw, the difference is 0.010 aw, which falls within the meter's stated ±0.02 aw accuracy specification.
If a verification result appears questionable, repeat the test using a correctly handled standard after allowing the meter and standard to reach stable, comparable temperatures.
Routine verification with known water activity standards helps confirm that the meter is performing as expected.
Cambridge supplies water activity standards at multiple reference points, including 0.250, 0.350, 0.500, 0.760, 0.920, 0.984 and 1.000 aw.
Choose standards that appropriately bracket the range of the products you normally test and follow your instrument, quality-system and standard-manufacturer procedures for verification or adjustment.
The PCE-WAT 10 uses sample dishes with an approximately 35 mm internal diameter.
The meter includes five sample dishes, and replacement cups are available for laboratories that perform frequent testing.
Cambridge also supplies replacement sample cups for the PCE-WAT 10 in larger pack quantities for routine QA/QC use.
The PCE-WAT 10 and PCE-WAM 10 are both portable entry-level water activity meters, but they are not the same instrument.
| Feature | PCE-WAT 10 | PCE-WAM 10 |
| Water Activity Range | 0.00–1.00 aw | 0.01–1.00 aw |
| Resolution | 0.01 aw | 0.01 aw |
| Published Accuracy | ±0.02 aw | ±0.03 aw |
| Stored Results | 99 | Not listed as an onboard-memory feature |
| Included Sample Dishes | 5 | 3 |
| Temperature Accuracy | ±0.2°C | ±1°C |
Choose the PCE-WAT 10 when the tighter ±0.02 aw published accuracy, internal result memory and improved temperature specification are useful to your QA/QC workflow.
For laboratories requiring higher resolution, multi-point calibration, greater data storage or more advanced measurement modes, visit Cambridge's Water Activity Meter Comparison.
| Model | PCE-WAT 10 |
| Water Activity Range | 0.00 to 1.00 aw |
| Water Activity Resolution | 0.01 aw |
| Water Activity Accuracy | ±0.02 aw |
| Temperature Range | -10 to 60°C / 14 to 140°F |
| Temperature Resolution | 0.01°C / 0.018°F |
| Temperature Accuracy | ±0.2°C / ±0.36°F |
| Measurement Rate | Approximately 5 minutes |
| Sensor | Non-conductive humidity sensor |
| Memory | 99 data records |
| Display | Backlit LCD |
| Menu Language | English |
| Protection Class | IP20 |
| Sample Dish Internal Diameter | 35 mm / 1.4 in. |
| Operating Conditions | 0 to 50°C / 32 to 122°F, 0 to 80% RH |
| Storage Conditions | -10 to 60°C / 14 to 140°F, 0 to 90% RH |
| Power | 3 × 1.5 V AAA batteries |
| Dimensions | 147 × 75 × 53 mm / 5.8 × 3.0 × 2.1 in. |
| Device Weight | 250 g |
The meter has an IP20 protection rating. Keep the instrument and sensor protected from water, washdown, condensation and direct exposure to liquids even when testing liquid samples.
Software or calibration documentation may vary by package or regional configuration. Confirm any specific documentation or computer-interface requirements when ordering.
The PCE-WAT 10 measures water activity in foods, ingredients, feed, pharmaceutical materials, chemicals and research samples. It can measure suitable powders, granules, solids, liquids and pastes.
PCE specifies water activity accuracy of ±0.02 aw with 0.01 aw resolution.
The PCE-WAT 10 measures from 0.00 to 1.00 aw.
PCE specifies an approximately 5-minute measurement rate. Consistent sample preparation and stable temperature conditions remain important for comparable results.
No. Moisture content measures the total amount of water in a product. Water activity measures how available that water is for processes such as microbial growth and chemical reactions. Two products with similar moisture content can have different water activity values.
A reading of 0.77 aw against a 0.760 aw standard differs by 0.010 aw, which is within the PCE-WAT 10's stated ±0.02 aw accuracy. Allow the meter and standard to reach stable, similar temperatures, follow the standard's handling instructions and repeat the measurement before concluding there is a problem.
Yes. PCE identifies the meter for solid, powder, granular, liquid and pasty samples. Avoid overfilling the sample cup or allowing material to contact the sensor.
Yes. Powders and granular products are among the sample types identified by PCE for the PCE-WAT 10.
The internal memory stores up to 99 measurement records.
Yes. Sample temperature is displayed together with water activity. The stated temperature measurement range is -10 to 60°C with 0.01°C resolution and ±0.2°C accuracy.
No. The instrument has an IP20 protection rating and should be protected from water, washdown and condensation.
Yes. Water activity is an important factor in food shelf-life and microbial-stability studies. It should be evaluated together with formulation, pH, processing, packaging, storage conditions and other product-specific factors.
No single water activity value should be treated as a universal safety guarantee. Most foodborne pathogens do not grow below approximately 0.85 aw, but yeasts and moulds can grow at lower values and product-specific hazards, processing conditions and regulatory requirements must still be considered.
The meter uses sample dishes with an internal diameter of approximately 35 mm. Cambridge supplies replacement PCE-WAT 10 sample cups in packs of 200 for routine testing.
They should be measured under stable and comparable temperature conditions whenever possible. Water activity is temperature dependent, so large temperature differences can affect results and make comparisons less meaningful.
The PCE-WAT 10 has a published accuracy of ±0.02 aw, 99-result internal memory, five included sample dishes and ±0.2°C temperature accuracy. The PCE-WAM 10 is a more basic model with ±0.03 aw published accuracy and three included sample trays.
Cambridge Environmental Products supplies the PCE-WAT 10 Water Activity Meter in Canada along with replacement sample cups, water activity standards and other water activity testing equipment for food and beverage, agriculture, research, pharmaceutical and industrial laboratories.
Cambridge Environmental Products supplies water activity meters, standards, sample cups and related QA/QC equipment across Canada.
If you are unsure whether the PCE-WAT 10 provides enough accuracy for your application, send us your sample type, expected aw range, number of tests per day, required accuracy, documentation requirements and whether the instrument will be used for routine QA/QC or formal method validation.
The PCE-WAT 10 is a practical option for routine water activity testing when 0.01 aw resolution, ±0.02 aw accuracy and portable operation meet your application's requirements.
If you need higher resolution, greater accuracy, multi-point calibration, higher sample throughput or advanced data management, Cambridge can help compare the PCE-WAT 10 with other available water activity systems.
