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.
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 Scale (Organoleptic Chart Example)
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 Score||Days after catch||Comment|
|14 to 18||0 to 2 days||Very fresh|
|12 to 13||2 to 4 days||Fresh|
|10 to 11||5 to 7 days||Neutral with some smell|
|7 to 9||7 to 14 days||Neutral with some smell|
|5 to 7||14 to 16 days||Not graded, nearly spoiled|
|3 to 4||16 to 18 days||Not edible & spoiled|
|0 to 2||18 days or more||Not edible & spoiled|
Conduct Government, University & Non-profit research projects.
Objective data driven results to ensure consistent quality.
Ensure integrity of fishing contests & rule enforcement.
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.
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:
Rugged & Ready for outdoor use:
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:
Fish Freshness Meter (Torrymeter) FAQ
Fish Freshness Meter (Torrymeter) Specs:
|Device Size||6.3 x 3.15 x 1.0 inch|
(160 x 80 x 25 mm)
|Weight||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 body size (length) needed||2 inches (10 cm)|
|Minimum fish thickness needed||0.4 inch (10 mm)|
|Battery||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|