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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.

To purchase or questions, contact us anytime.
Distell Fish Freshness Meter Torrymeter

Results in seconds

Accurate & instant results to make on the spot decisions.

Handheld & Portable

Light weight & small. Carry it in your bag & take it anywhere.

Rugged & Durable

Water proof to IP65 standards & made for use in wet conditions.

All day battery life

Up to 8 hours of use to last all day for outdoor field measurements.

Non destructive

Use your fish and meat again, it does no harm!

Easy to use

Use it right out of the box with no special training needed.


Government, University & Non-profit organization research projects.

Quality Control

Objective & data driven results to ensure consistent quality.

Fishing Contests

Determine winners & rule enforcement of fishing contests and derby's.

How It Works

Distell's Fish Freshness Meter (Torrymeter) measure's fish freshness based an Organoleptic Chart which provide an easy to see 0 – 16 scale of fish freshness. 16 being extremely fresh to under 4 being spoiled.

The Fish Freshness Meter (Torrymeter) measures 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 us to calibrate the freshness meter’s response.

The sensors emit a small alternating current through the fish and calculates a voltage. The phase angle between the alternating current and voltage is measured and converted to an easy to understand scale of 0 – 16.
Distell Fish Freshness Meter Torrymeter

Fish Freshness Scale

(Organoleptic Chart Example)
Distell Fish Freshness Meter Torrymeter Organoleptic Chart Sample
How to read the chart:
The Freshness Meter score scale may differ for each fish types, but in general, the Freshness Meter score range is from 0 - 16. The 16 being the highest and 0 being lowest.
Freshness Meter Score:
14 - 16: Very Fresh, less than 2 days from catch.
12 - 14: Fresh, 2-4 days from catch.
10-12: Neutral, 5-7 days from catch.
7-10: Neutral, 7 - 14 days from catch.
5-7: Not graded. 14-16 days from catch, strong odor.
3-5: Not graded. 16-18 days from catch. Not edible.
0-3: Not graded: considered spoiled and not edible.
Distell Fish Freshness Meter Torrymeter back

Easy To Use & Rugged

Only three buttons: On/Off, Reset & Read. Turn it on, select your meat type and measure. Yes, it's that simple!
Ease of Use:
No special training or prior knowledge needed
Only three buttons: ON/OFF, Reset & Read.
Big LCD display & easy to navigate menu options.
Rugged & Ready for Outdoor!
Water proof to IP65 standards.
Durable & sturdy metal casing.
All day rechargeable 8 hour battery life.

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 then get an "average" of those readings as the result.

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


No device or system is perfect, this goes for Distell's Fish Freshness Meter as well. We are 100% upfront with what's capable with this device.
Fish must be at least 2 inches (50 mm) and 0.4 inch thick.
Can NOT measure frozen fish, it must be completely thawed or defrosted.
Can hold up to 1,000 measurement data results on the device before needing to be off loaded to your PC.
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To buy or purchase, contact us!

1 year warranty
30 days money back guarantee
1 year Warranty30 day money back guarantee

Fish Freshness Meter (Torrymeter) Details

Distell Fish Freshness Meter Torrymeter front
Meter size
6.3 x 3.15 x 1.0 inch
(160 x 80 x 25 mm)
0.88 lbs (400 grams)
Sensor size
1.97 x 1.0 x 0.4 inches
(50 x 25 x 10 mm)
Meter casing material
ABS plastic with IP65 water proof
Sensor operating frequencies
2 kHz
Minimum fish size it can measure (length)
2 inches (10 cm)
Minimum fish thickness it can measure
0.4 inches (10 mm)
Battery type
Internal rechargeable: Nickel Metal Hydride (NiMH)

* Can not be replaced
Shipment weight for 1 meter
6.6 lbs (3 kg)
Battery life
8 hrs continuous use
Battery recharge time
12 to 15 hours from empty

Fish Freshness Meter (Torrymeter) FAQ

How do I purchase and buy the Torrymeter?
Please call us at: 1.800.295.6134 or email at:
We do not provide pricing information on our websites.
What is the minimum fish body size and thickness needed for Distell's Fish Freshness Meter (Torrymeter) to measure accurately?
For Distell's Fish Freshness Meter (Torrymeter), the minimum fish body size (not including the head or tail) is 2 inches (50 mm).

For fish thickness, the body (torso) is 0.4 inch (10 mm) to measure the fish freshness accurately.
How accurate is Distell's Fish Freshness Meter (Torrymeter)?
Distell's Fish Freshness Meter (Torrymeter) has an accuracy of +/- 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 handled, but more or less +/- 1 day.

You can determine if the fish has been previously frozen right away.
What can Distell's Fish Freshness Meter (Torrymeter) be used for?
The 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 Torrymeters 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
How does Distell's Fish Freshness Meter (Torrymeter) work?
The Torrymeter emits a low frequency 2 KHz signal from one sensor and calculates the difference by the receiving sensor. The results is processed and provides the Freshness Scale which is developed by Distell's experience and knowledge.
Can the fish being measured be used after testing?
Yes it can. The Torrymeter is non-destructive measurement device and tool so it does no damage to the fish. 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.
Can the Fish Freshness Meter (Torrymeter) measure on live fish?
Yes it can. The Torrymeter can be used to measure on live fish as long as you're able hold the fish steady for then sensors to take 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.
Can Distell's Fish Freshness Meter (Torrymeter) measure frozen fish?
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.
What precautions should I take when comparing Distell's Fish Freshness Meter (Torrymeter) results with laboratory analysis?
When you're comparing Distell's Fish Freshness Meter (Torrymeter) with a laboratory analysis, make sure to follow proper preparation procedure. Otherwise, you may get a different result from the laboratory and will cause confusion.

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

- Place the sensor head fully in contact with the sample (fish) being tested carefully to exclude any air cavities.
- Press and hold the ‘READ’ button until the reading has been taken and is displayed on the LCD screen.
- Measure in the same location each time to be consistent.
- It's normal for Distell's Fish Freshness Meter (Torrymeter) to give different value results at different measurement locations 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.
Do we still need to conduct a normal laboratory test to confirm the measurement results?
You're free to conduct normal laboratory test anytime, however Distell's 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 Distell's Fish Freshness Meter (Torrymeter) readings. If you find any discrepancies, please contact us to have the meter calibrated.
What are some limitations of Distell's Fish Freshness Meter (Torrymeter)?
Distell's 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
Does temperature affect the performance or results of Distll's Fish Freshness Meter (Torrymeter)?
Within the overall measurement limits of 0C to 10°C (32F to 50F) and provided that the fsh or fish fillet being measured with Distell's Fish Freshness Meter (Torrymeter) contains no ice crystals, temperature should have no significant effect.

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

If the fish has been previously frozen, it may look fresh, high quality, not spoiled or smelly. However, using Distell's Fish Freshness Meter (Torrymter) will quickly check 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 fressh fish or fish that have been stored properly at or slightly above 0° C since being caught.

We've 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 accurate results, operator should make sure that 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).

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