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Fish Freshness Meter (Torrymeter)

Measure fish freshness in seconds.

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  • Distell Fish Freshness Meter Torrymeter
  • Distell Fish Freshness Meter Torrymeter back
  • Distell Fish Freshness Meter Torrymeter LCD
  • Distell Fish Freshness Meter side
  • Distell Fish Freshness Meter Torrymeter box
  • Distell Meter Power Charger

Benefits & Features

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.

Our Clients

Trusted by world's most demanding Scientists, Researchers & Technicians.

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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You're purchases are safe!

1 year warranty
30 days money back guarantee
1 year Warranty30 day money back guarantee
We're ready to help & support anytime.

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 frequency
2 KHz
Minimum fish size it can measure
2 inches
(50 mm)
Minimum fish thickness it can measure
0.4 inch (10 mm)
Battery type
Internal rechargeable: Nickel Metal Hydride (NiMH)
Shipment weight for 1 meter
6.6 lbs (3 kg)
Battery life
8 hrs use. Recharge time is 12 to 15 hours from empty.
Fish Freshness Meter (Torrymeter) FAQ's
General Distell Meter FAQ's
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.
It was developed to measure relative freshness of wet fish, whole fish and fillets such as: Cod, Whiting, Herring, Mackerel, Tilapia and many others. The meter can measure freshness of most fish species caught and processed around the world.

The meters are used in various applications for many years:
- 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 markets and stores
- check the age of fish during fishing and angling competitions
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 Distell's Fish Freshness Meter (Torrymeter). It's a NON-DESTRUCTIVE measurement, meaning you can measure the fish many times without affecting the quality of the fish.
Yes it can. Distell's Fish Freshness Meter (Torrymter) are designed for non-invasive and non-destructive, meaning it does not harm to the fish.

You can use it on live fish and also to sell the fish after making measurements.
No it can not. The fish must to properly defrosted or thawed in order for Distell's Fish Freshness Meter (Torrymeter) to properly measure the fish freshness.
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.
You are free to conduct a normal laboratory test anytime, however Distell's Fish Freshness Meter (Torrymeter) is designed to allow many measurements to be taken to routinely to test the fish product. 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.
When you know that the measurements made by Distell's Fish Freshness Meter (Torrymeter) are going to be compared to some form of laboratory analysis, always make sure that rigorous preparation procedure if followed. Otherwise, you may get a different result from the laboratory and this will create confusion and doubt.

Preparation instructions are clearly described in Distell's Fish Freshness Meter (Torrymeter) Handbook, but to make sure there is no doubt, a brief description and instructions are below:

Place the sensor head fully in contact with the sample (fish) 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 and month-to-month. It is normal for Distell's Fish Freshness Meter (Torrymeter) 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 fsh or fish fillets 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 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.

If the fish has been previously frozen, it may look fresh and in high quality, not spoiled or smelly. However, using Distell's Fish Freshness Meter (Torrymter) 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 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).
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
Under normal use, with full battery charged, it will last 8 hours. The time to fully recharge the device from empty is about 12 to 15 hours.
Yes. All Distell's meters are waterproof and certified to IP65 standards. This means you can use it in wet conditions in the field study on lakes, oceans and wet markets.
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.
You can use the free download cable included in the kit to transfer the measured results from the device to your PC.

Once all the data has been transferred to your PC, you can use Distell's free Software Data Management system to manage all the data.
Yes. All Distell's meters meet the HACCAP (Hazard Analysis and Critical Control Point) standards and comply with IP65 standards which means it can be used in wet conditions.

Distell's Fish Freshness Meter (Torrymeter) Documents

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