Fish Freshness Meter (Torrymeter)

Measure fish freshness in seconds. Torrymeter, the industry leader in handheld non-destructive fish freshness device trusted worldwide in the fish market industry.

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What is a Fish Freshness Meter (Torrymeter)?

Fish Freshness Meter (Torrymeter) is a hand held device that measures fish freshness used world wide by researchers, fish & seafood market vendors and fishing tournament directors.

It measures fish freshness in seconds, accurate, easy to use and nondestructive, meaning you can use the fish safely after measuring it.

Fish Freshness Meter Torrymeter Front

Results in seconds

Accurate & instant results to make on the spot decisions.

Handheld & Portable

Just like the size of a smartphone, carry it anywhere you like.

Rugged & Durable

Made for outdoor use and water proof to IP65 standards.

Long battery life

Up to 8 hours of all day use. Go for a long field measurements.

Non destructive

No harm done to your fish or the meat being measured.

Ease of use

Anyone can measure right out of the box, with no special training.

How does the Fish Freshness Meter (Torrymeter) work?

The Fish Freshness Meter (Torrymeter) measure’s fish freshness based an Organoleptic Chart which provide a fish freshness scale from 0 to 18, the 18 being most fresh.

The sensors emit a small current through to the fish and calculates a voltage. The phase angle between the current and voltage is measured, then is converted to provide an easy to understand scale of 0 to 18.

The fish freshness scale is measured by conductance, capacitance and q-factor of the fish flesh and muscle structure. As the fish spoils and as bacteriological activity increases, there is a redistribution of intra-cellular and extra-cellular electrolytes. This redistribution changes the capacitance and resistance of the flesh and muscle structure. These changes in value allow it measure the fish freshness.

Fish Freshness Meter Torrymeter box set

Fish Freshness Scale (Organoleptic Chart Expample)

How to read the chart: The Freshness Meter score scale may differ for each fish types, but in general, the Freshness Meter score ranges from 0 to 18. The 18 being the highest and 0 being lowest.

Freshness ScoreDays after catchComment
14 to 180 to 2 daysVery fresh
12 to 132 to 4 daysFresh
10 to 115 to 7 daysNeutral with some smell
7 to 97 to 14 daysNeutral with some smell
5 to 714 to 16 daysNot graded, nearly spoiled
3 to 416 to 18 daysNot edible & spoiled
0 to 218 days or moreNot edible & spoiled


Conduct Government, University & Non-profit research projects.

Quality Control

Objective data driven results to ensure consistent quality.

Grocery Stores

Analyze supplier quality level, reduce waste and prolong shelf life.

Who & How do people use the Fish Freshness Meter (Torrymeter)?

Researchers, Scientists & Lab Technicians

Used in key US Government research projects to monitor fish growth & health.

Seafood Market Quality Assurance

To measure quality from suppliers to improve logistic or storage techniques. Determine shelf life & adjust price accordingly.

Fishing Tournaments & Derby Directors

Ensure integrity of event & winners by determining if the fish has been previously caught before the event.


To ensure seafood received from suppliers meets agreed upon quality level so that they can serve the best seafood to customers.

Fish Freshness Meter-Torrymeter LCD Display

Easy To Use & Rugged

Only three buttons: On/Off, Reset & Read. Turn it on, select the fish type & measure. Yes, it’s that simple!

Ease of use:

  • No special training or prior knowledge needed
  • Only three buttons: ON/OFF, Reset & Read
  • LCD display for easy menu options

Rugged & Ready for outdoor use:

  • Water proof to IP65 standards
  • Durable & sturdy metal casing
  • All day rechargeable 8 hour battery life
Fish Freshness Meter Torrymeter bottom view
Fish Freshness Meter Torrymeter Kit

Fish Freshness Results in Seconds & Non-destructive

Depending on the size of the fish, take 1 to 4 measurements per fish for reliable & accurate reading. You’ll get an “average” of those readings as the fish freshness result.

The Fish Freshness Meter was designed to be used on live fish so it does no harm to the fish. You can use the fish or sell it with confidence to your customers.

Any limitations of the Fish Freshness Meter (Torrymeter)?

No device is perfect and here are some limitations of the Fish Freshness Meter (Torrymeter) you need to be aware of:

  • Can NOT measure frozen fish. It must be thawed.
  • Size limits: fish body length, not including the head & tail must be at least 2 inches. Fish body thickness of at least 0.4 inch.
  • Can not hold more than 1,000 measured results on the device at any one time. You can upload the results to the PC anytime.
Fish Freshness Meter Torrymeter

Fish Freshness Meter (Torrymeter) FAQ

Please call us at: 1.800.295.6134 or email at: We do not provide pricing information on our websites.

In order for the Fish Freshness Meter (Torrymeter) to measure the fish freshness accurately, the minimum fish body size (not including the head or tail) has to be at least 2 inches (50 mm).

For fish thickness, the body (torso) has to be at least 0.4 inch (10 mm) to measure the fish freshness accurately.

The Fish Freshness Meter (Torrymeter) has an accuracy of about +/- 1 day on an un-irradiated, unfrozen or thawed fish. Many factors go into the accuracy such as fish species and how the fish is killed and handled afterwards, but in general, it’s about +/- 1 day.

You can determine right away if the fish has been previously frozen since it’ll give you a low score of 7 to 5 quality scale.

The Fish Freshness Meter (Torrymeter) was developed to measure freshness of fish, whole fish and fillet fish such as: Cod, Whiting, Herring, Mackerel, Tilapia and others. The Torrymeter can measure freshness of most fish species caught and processed around the world.

The Fish Freshness Meter (Torrymeter) are also used to:
– estimate the freshness and quality of fish
– grade fish according to European & International Standards (E-A-B)
– determine if a fish has been frozen or irradiated
– estimate shelf life in fish markets and stores
– check the age of fish during fishing and angling competitions

The Fish Freshness Meter (Torrymeter) sends a low frequency (2 KHz) signal from one sensor (transmitter) and calculates the difference when it’s received by the receiving sensor. The results is processed by a proprietary algorithm to show the results of fish freshness scale.

The special algorithm to show the fish freshness was developed with years of experience and knowledge. The fish freshness “Torry Scale” is widely accepted in the Fish & Seafood industry as the “golden standard” of fish freshness scale rating.

Yes absolutely. The Fish Freshness (Torrymeter) is non-destructive and non-invasive measuring device so it does no damage to the fish. It emits a small amount of electricity in a shot burst similar to how you measure fat in humans.

You can measure the fish many times as needed without affecting the quality of the fish. After measurement, you can sell it or cook to eat safely.

The Fish Freshness Meter (Torrymeter) can measure on live fish as long as you’re able hold the fish steady enough for then sensors to take the measurements. Since the Torrymeter is a non-invasive and non-destructive device, it’s harmless to use on live fish.

It’s a great way to monitor the fish health and growth as it responds to certain diets and environmental conditions.

No it can not. The Fish Freshness Meter (Torrymeter) can not measure fish freshness while the fish is still frozen. The fish must to properly defrosted or thawed to provide an accurate fish freshness result.

You’re free to conduct normal laboratory test anytime, however the Fish Freshness Meter (Torrymeter) is designed to measure as many times needed to test the fish.

Occasional laboratory tests can be conducted to confirm the results of the Fish Freshness Meter (Torrymeter) readings. If you find any discrepancies, please contact us to have the meter calibrated.

When you plan to compare the Fish Freshness Meter (Torrymeter) with a laboratory analysis, make sure to follow proper preparations and procedure. Otherwise, you may get a different result that will cause confusion.

Preparation instructions are clearly described in the Fish Freshness Meter (Torrymeter) Handbook, however, here are some guidelines:

– Make sure that all of the 4 sensors are firmly touching the fish.
– Press and hold the ‘READ’ button until the reading has been taken and is displayed on the LCD screen.
– Measure in the same location of the fish each time to be consistent.
– It’s normal for the Fish Freshness Meter (Torrymeter) to give different results at different measurement locations on the same fish since 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.

The Fish Freshness Meter (Torrymeter) can not measure the following:
– Fish that is frozen, it must be thawed or defrosted
– Irradiated
– Cooked
– Stored in salt water
– Fish with thick-skin
– Fish skin has dried out

If the fish is around 0C to 10°C (32F to 50F) and the fish has no ice crystals, temperature should have no significant effect on the results.

If the fish was previously frozen or contain ice crystals, the Fish Freshness Meter (Torrymeter) will display a low value result between 1 and 4. This is because freezing the fish disrupts its cell structure which affects the capacitance and conductivity within the flesh. This low value displayed by the Torrymeter infers that the fish has started to spoil.

If the fish has been previously frozen but it may look fresh and of high quality. However, using the Fish Freshness Meter (Torrymter) will quickly determine if the fish has been previously frozen.

As a fish buyer, this is important as the shelf life of previously frozen fish is significantly lower than that of the fresh fish or a fish that have been stored properly at or slightly above 0° C since being caught.

We’ve found that fish down to –2°C (28F) normally do not contain ice crystals and can be measured as normal. Also, fish stored at or above 10°C (50F) can suffer moisture loss and create a variance from the natural fish state.

For consistent accurate results, we recommend to measure the fish at an ambient temperature of about 0 – 10°C (32F to 50F) for consistent and accurate results.

Assurant Innovations takes all types of payment forms such as credit cards, Paypal, PO (Purchase Orders) and electronic bank deposits. We can accommodate your payment processes.

For US Federal, State, County and City Government contracts, we can follow your specific payment methods as required. Contact us anytime and we’ll be happy to assist.

The device delivery time is anywhere from 14 to 21 days from the time we receive your payment or the PO (Purchase Order). We’ll do everything we can delivery as quick a possible.

Since these are measuring devices, each device is manually calibrated and checked for quality prior to shipment for each order, this is why it takes time to deliver.

We strive to aim for superior customer experience. If the devices fail to meet your expectation, we provide a full 30 day money back guarantee if the devices has any issues. We also provide 1 year full warranty and all parts and labor.

Please contact us right away if you have any issues with the devices.

Fish Freshness Meter (Torrymeter) Specs:

Device Size6.3 x 3.15 x 1.0 inch
(160 x 80 x 25 mm)
Weight0.88 lbs (400 grams)
Sensor size1.97 x 1.0 x 0.4 inches
(50 x 25 x 10 mm)
Meter casing materialABS plastic with IP65 water proof
Sensor operating frequencies2 kHz
Minimum fish body size (length) needed2 inches (10 cm)
Minimum fish thickness needed0.4 inch (10 mm)
BatteryNickel Metal Hydride (NiMH)
* Can not be replaced
Shipment weight for 1 meter6.6 lbs (3 kg)
Battery life8 hrs continuous use
Battery recharge time12 to 15 hours from empty

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