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Fish Freshness Meter (Torrymeter)

Trusted by world’s most demanding customers & proven industry leader for over 60 years.

Distell Fish Freshness Meter (Torrymeter)
Fish Freshness Meter Kit

Measure accurate Fish Freshness in just 30 seconds!

Benefits & Features

Non-destructive, no harm done!
No harm done to the measured samples, re-measure & re-use again!
Easy to Use
No special training needed, use it right away out of the box with minimal maintenance.
Portable & Durable
Take it anywhere, anytime! Rugged design with all day battery life!
Instant & Accurate Results
Accurate results lets you make informed decision on the spot in less than 30 seconds.

Easy to read Freshness Scale from 0 to 14

0 -> 7: Spoiled. More than 8 days on ice. Not edible.
8 -> 11: 4 to 7 days on ice. Still a bit fresh to mild odor and smell.
12 -> 14: 2 to 3 days on ice. Very fresh with little or no odor.
Each fish species has its own unique reading results. See documentation for details.
Torrymeter Details (PDF)

1 year warranty & 30 days money back guarantee with purchase

Fish Freshness Meter (Torrymeter) Use Cases

Grocery Stores

Grocery Stores

Quality control & increasing shelf-life
Fishing derbies & contests

Fishing derbies & contests

Determining winners of fishing contests
Government & Universities

Government & Universities

Research & Certifications

Over 32 Fish Species Supported

Sea Bream




and many more!

Measure on skin, flesh or filleted fish.

Download complete list of fish species supported.

Your fish not on the above list?

Make your own custom calibration.

Trusted by world's most demanding clients

Supporting our US Government Agencies

Assurant Innovation is committed to providing the world’s best products, services and support to US Government Agencies. We’re excited to work with world’s best researchers solving tough ecological and environmental problems we face.


For US Government Contracts:

DUNS: 079396543

CAGE Code: 752N0

NAICS: 334516, 423490, 334513, 334519, 561990, 541611


Minority Owner

Small Business Enterprise

Is finding out fish freshness important to you?

Torrymeter is your answer – Call or Email us today for pricing & questions.

Documents & FAQ

Fish Freshness Meter (Torrymeter) FAQ’s

The accuracy of the measurements are +/- one day on an un-irradiated, unfrozen or thawed fish. Many factors go into the accuracy such as species and how the fish is handled, but more or less 1 day.
A very low power 2 KHz sine wave signal is sent to one electrode sensor to the other. The signal is then picked up at other electrode and the device measures the difference. The results is processed and provides the Freshness Scale,
Yes and this is one of the big advantages of using the Fish Freshness Meter (Torrymeter). It is a NON-DESTRUCTIVE measurement meaning you can measure the fish many times without affecting the quality of the fish.
You are free to conduct a normal laboratory test anytime, however the Fish Freshness Meter is designed to allow many measurements to be taken to routinely to test the product. Occasional laboratory tests can be conducted to confirm the results of the meter reading. If you find any discrepancies, please contact us to have the meter calibrated.
When you know that the measurements made by the Freshness Meter are going to be compared to some form of Laboratory Analysis, always ensure a rigorous preparation procedure. Otherwise you may get a different result from the laboratory and this will create confusion and doubt.

The preparation instructions are clearly described in the Freshness Meter Handbook, but for the avoidance of doubt we have given a brief description here, as follows:

Place the sensor head fully in contact with the sample, being careful to exclude any air cavities. Press and hold the ‘READ’ button until the reading has been taken and is displayed on screen.
It"s important to be consistent by placing the sensor in the same location each time. This will ensure consistent and comparable results day-to-day…month-to-month. It is normal for the Freshness Meter to give a different value at different measurement sites on the same fish. Different parts of the fish will spoil at different rates due to the bacteria levels, fat content, muscle structure, and cell disruption within the fish.
Within the overall measurement limits of 0C to 10°C (32F to 50F) and provided that the Fish or Fish Fillets being measured with the Freshness Meter contains no ice crystals, temperature should have no significant effect.

Where the Fish or Fish Fillets have been previously frozen or contain ice crystals, the Freshness Meter will display a very low value (normally between 1 and 4). This is because the act of freezing the fish disrupts its cell structure which affects the capacitance and conductivity within its flesh, similarly to the cellular breakdown caused by bacteriological activity. This low value, displayed by the meter, infers that the change in conductivity is spoilage.

Of course, where the fish has indeed been frozen, the fish looks very fresh and of high quality and is not normally spoiled or smelly. The Freshness Meter serves as a useful quality check for fish buyers as the shelf life of previously frozen fish is significantly lower than that of fish which have been stored properly at or slightly above 0° C since being caught.

We have found that Fish and Fish Fillets down to –2°C (28F) normally do not contain ice crystals and can be measured as normal. We've also found that Fish or Fish Fillets, stored at or above 10°C (50F) can suffer moisture loss and create a variance from the Natural Fish State.

For consistent, wholly accurate results, the operator should ensure that the Fish or Fish Fillets are measured at the same ambient temperature on a daily basis within a temperature range of 0 – 10°C (32F to 50F)
The Freshness Meter will not work with produce that has been:
- Frozen
- Irradiated
- Cooked
- Stored in salt water
- Fish with thick-skin
- Fish skin has dried out


Distell Product General FAQ’s

We accept all major credit cards, Paypal and PO (Purchase Orders). For Government Agencies, Universities and Hospitals, we can follow your preferred method of payment. Please contact us for details.
After confirming your purchase or receiving the PO (Purchase Oder) please allow 14 to 21 days to send the product to your location.
We offer 30 day money back guarantee on all purchase and 12 months warranty. If for any reasons you want to return or ask for refund, please let us know right away.
Under normal use conditions, the battery when fully charged should last 8 hours. The time to fully charge device when empty is about 12 to 15 hours.
Yes all of Distell's devices are waterproof certified with IP65 standards. This means you can use it in wet environments like field study on lakes, oceans and wet markets.
Yes, all of Distell's products are handheld sizes that is light weight, easy to carry and ruggedized for outdoor use. Take it with you anywhere and anytime.

Size: 7.67in x 3.94in x 1.57in (195mm x 100mm x 40mm)
Weight (including batteries): 0.617lb (280g)

Just a bit bigger than a large smart phone.
Under normal use frequency, we would recommend to have the meters re-calibrated every 12 months.
If you're using the device and measuring hundreds of times a day, we recommend 3 or 3 months.

Everytime we receive the device for re-calibration, we thoroughly clean, make software updates and we can recommend other fixes if needed.
YES it's because Distell's devices are NON-INVASIVE and harmless,it can be used to monitor individual fish.
YES. Distell meters has memory inside to store up to 1,000 sets of measurements. These reading can be downloaded into your computer at any time using Distell's Data Management Software. This Software is provided as part of your purchase.

General Documents

Technical Documents

Current customers: check your device firmware version for the correct documents.
For future customers: see the latest v3.x documents.

Any more questions? Contact Us Today!