Last Updated on July 31, 2026 by Daniel Globe
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Recording a catch should not require a bulky tool or a supply of disposable batteries. The Calamus Lightweight USB Charging Fish Scale is a pocket-size digital model built for anglers who want a clear reading, simple memory tools, and a 55-pound capacity. Its strongest points are its 1.7-ounce body, USB-C charging, and three-weight memory. Its main limitation is that the product listing does not claim waterproof or water-resistant protection, so you need to keep it away from heavy spray and submersion.
| Specification | Detail |
|---|---|
| Brand | Calamus |
| Model | TMBK01 |
| ASIN | B0DJ48KM32 |
| Product type | Rechargeable digital fish scale |
| Dimensions | 3.2 x 1.9 x 0.6 inches |
| Scale weight | 1.7 ounces |
| Maximum capacity | 55 lb / 25 kg |
| Measurement increments | 0.7 oz, 0.04 lb, or 0.02 kg |
| Display | Backlit LCD |
| Power | Rechargeable battery with included USB-C cable |
| Continuous use | Up to 5 hours on a full charge |
| Power saving | Automatic shutoff after 2 minutes of inactivity |
| Weight lock | Automatic reading lock after about 2 seconds |
| Memory | Stores 3 weights and shows total and average |
| Units | Pounds/ounces and kilograms |
| Housing | ABS body with textured sides and an ergonomic handle |
| Hook storage | Hook secures against the back panel |
| Color options | Black and blue, with this link pointing to black |
What Is the Calamus Lightweight Fish Scale?
The Calamus TMBK01 is a handheld hanging scale designed mainly for weighing fish. You lift the catch from the scale’s hook, wait for the reading to stabilize, and use the backlit screen to view the weight in pounds and ounces or kilograms. The scale can hold three readings in memory, then calculate their total and average.
Its defining feature is size. At 3.2 inches long and 1.7 ounces, it takes up less room than many fish scales with built-in tape measures or large gripper handles. The included USB-C cable also removes the need to carry spare disposable batteries.
Who Should Buy It?
Best For
- Anglers who usually catch fish under the 55-pound limit
- Travelers who want a scale that fits easily in a pocket or small tackle tray
- Buyers who prefer USB-C charging and simple three-catch tracking
Skip If
- You need a scale with verified waterproof or water-resistant construction
- You want a built-in measuring tape, lip gripper, or more than three memory slots
- You regularly weigh fish near or above 55 pounds
Before You Buy: The listing does not state that this scale is waterproof or water-resistant. Keep it out of heavy spray, do not submerge it, and let the body and charging area dry fully before connecting the USB-C cable.
Design and Portability
The Calamus scale is unusually compact for a 55-pound digital model. Its 3.2 x 1.9 x 0.6-inch body can sit in a shirt pocket, small tackle-box compartment, kayak crate pouch, or travel bag without taking over the space you need for lures and tools.
The ABS housing keeps the body light, while textured sides and an ergonomic handle give your fingers a more secure surface to hold. The hook clips against the back panel for storage, which helps reduce snagging and keeps the metal hook from moving around loose beside other gear.
The tradeoff is leverage. A very small handle is easy to pack, but it may feel less comfortable than a larger two-handed scale when you lift a fish close to the 55-pound maximum. Keep your wrist straight and avoid holding a heavy catch longer than needed.
Display and Controls
The backlit LCD is designed for daylight, dawn, dusk, and shaded conditions. You can switch between pounds and ounces or kilograms, which is useful when local records, tournament rules, or fishing partners use different units.
The scale automatically locks a stable measurement after about two seconds. That feature can make the reading easier to record when the fish is moving, but you still need to lift smoothly and wait for the load to settle. The listing does not describe a mobile app, Bluetooth connection, or advanced calibration system, so this is best viewed as a straightforward handheld scale.
Accuracy and Weighing Performance
The stated 55-pound, or 25-kilogram, capacity covers common freshwater catches and many inshore fish. Readings change in 0.7-ounce, 0.04-pound, or 0.02-kilogram increments. Those increments are detailed enough for personal catch logs and casual comparisons without adding the size of a tournament-focused scale.
Resolution is not the same as certified accuracy. The product listing describes precision sensors, but it does not state that the scale is legal for trade or independently certified. For a tournament, record application, or any situation where official weight matters, follow the event or record-keeping rules and use an approved scale when required.
Power and Battery Life
The built-in rechargeable battery is rated for up to five hours of continuous use with the screen on. Since most anglers use a scale for brief checks, one full charge should cover many ordinary outings, although actual runtime can vary with charging habits, temperature, and backlight use.
Automatic shutoff starts after two minutes of inactivity to reduce wasted power. A USB-C cable is included, so you can recharge from a compatible wall adapter, power bank, or other USB power source. The listing does not state an exact charging time, so plan to charge before you leave instead of relying on a short stop at the ramp.
Pro Tip: Charge the scale before a trip, then test it at home with a known reference weight. This helps you confirm that the display returns to zero and that the scale is behaving consistently before you weigh a personal-best catch.
Memory and Catch Tracking
You can store up to three individual weights and review them later. The scale also calculates the total and average of the saved readings. That is enough for a short outing, a three-fish comparison, or a quick family fishing challenge.
Three slots are modest compared with larger tournament scales. If you track a full limit, manage culling decisions, or want a longer history, you may prefer a model with eight or more storage positions. For casual use, the smaller memory system is easier to learn and keeps the controls focused.
How It Performs in Real Use
For Bank and Pier Fishing
The low weight is the main advantage when you walk between spots. You can keep the scale in a pocket or compact tackle bag, then pull it out only when you need a measurement. The backlit display also helps when you fish early or stay until evening.
For Boats and Kayaks
The small body is easy to store where deck space is limited, and the rear hook holder reduces loose metal around line and tackle. The lack of a stated water-resistance rating matters more on a kayak or open boat, so store it in a dry pouch between uses and handle it with dry hands when possible.
For Travel and Backup Use
At 1.7 ounces, the Calamus works well as a backup scale in a travel kit. It also avoids the extra weight of spare disposable batteries. You still need access to a USB charging source, so pack the cable with your other electronics.
For Tracking Several Catches
The three memory positions, total, and average functions are useful when you want more than a single reading. They suit a short catch log, but the limited number of slots is not designed for managing a large tournament bag or a full day of detailed records.
How to Use It Correctly
- Charge before the trip. Use the included USB-C cable and avoid charging while the scale is wet.
- Start with no load on the hook. Power the scale on and confirm that the display reads zero before attaching a fish.
- Secure the catch. Attach the hook or your compatible weighing sling carefully, and keep the fish supported until you are ready to lift.
- Lift smoothly. Hold the scale upright, avoid swinging, and wait for the reading to lock after the weight settles.
- Save only the readings you need. Follow the included instructions for the memory button sequence, then review the total or average.
- Release or store the catch promptly. Minimize handling time, then return the hook to the back panel before packing the scale away.
Button sequences can vary by model version, so use the included instructions for clearing memory, changing units, or resetting a reading. Do not force the hook, exceed the 55-pound capacity, or lift a fish in a way that could injure you or the catch.
Care and Storage
Wipe the housing and hook after use, especially after fishing around saltwater. Use a soft cloth, avoid soaking the body, and let the scale dry before charging or closing it inside a tackle box. Store the hook against the rear panel to reduce scratches and tangles.
Check the hook and housing before lifting a heavy fish. The product listing does not identify user-replaceable parts or a specific warranty term, so contact the seller or Calamus if you need service, replacement information, or warranty details.
Pros and Cons
Pros
- Very compact 3.2-inch body and 1.7-ounce weight
- Rechargeable battery with an included USB-C cable
- Useful 55-pound capacity for common fishing situations
- Backlit display with pounds/ounces and kilogram modes
- Three-weight memory with total and average calculations
Cons
- No stated waterproof or water-resistant rating
- Only three memory slots
- No built-in tape measure or included lip gripper listed for this version
Is It Worth the Price?
The Calamus TMBK01 offers strong value for the price when your priorities are low weight, USB-C charging, a readable display, and basic catch memory. It gives you the core features most recreational anglers need without the extra bulk of a tape measure, large gripper, or app-connected display.
It is worth considering if you need a compact scale for everyday fishing or a backup kit. It is not the best fit if you need verified water resistance, more memory, a longer handle, or an all-in-one measuring system. Check the current seller, included items, and return terms before buying because offers can change.
How It Compares to Alternatives
The Rapala 50 lb High Contrast Digital Scale is a better match if you want eight storage locations, tare support, and a fish-friendly gripper, but it uses two AAA batteries and is a more feature-heavy option. The Berkley Digital Fish Scale with Tape-50 adds water-resistant construction, ten stored weights, and a 48-inch tape measure, which suits anglers who want weight and length in one tool.
The KastKing ToughTide is worth comparing when you want a rechargeable scale with a higher 65-pound capacity and more memory. The Calamus makes the most sense when compact size and low carry weight matter more than a tape, gripper, or expanded catch-management system.
Frequently Asked Questions
Is the Calamus Lightweight Fish Scale waterproof?
The product listing does not claim waterproof or water-resistant protection. Keep the scale out of heavy spray, do not submerge it, and dry it fully before charging or storage.
What is the maximum weight capacity?
The maximum stated capacity is 55 pounds, or 25 kilograms. Do not exceed that limit, and choose a higher-capacity scale if your target species may be heavier.
How precise are the displayed readings?
The display changes in increments of 0.7 ounce, 0.04 pound, or 0.02 kilogram. Those increments are suitable for personal catch tracking, but the listing does not describe the scale as certified for trade or official record weighing.
How many weights can the memory store?
It stores up to three individual weights. You can also view the total and average of those saved readings, which is useful for a short catch list.
How long does the rechargeable battery last?
The stated continuous runtime is up to five hours on a full charge, even with the screen on. The scale also shuts off after two minutes of inactivity to conserve power.
Can you weigh items other than fish?
You can weigh other hangable items that stay within the 55-pound limit and can be attached safely to the hook. It is not described as a legal-for-trade scale, so do not use it for commercial transactions that require certified equipment.
Does it come with a tape measure or lip gripper?
The verified listing for model TMBK01 identifies a USB-C cable as the included component and does not list a tape measure or lip gripper. Check the selected seller and package details before ordering because bundles and variants can differ.
What warranty and replacement parts are available?
The verified product listing does not state a specific warranty period or identify replacement parts. Review the current seller terms and contact Calamus or the seller for coverage and service details.
The Bottom Line
The Calamus Lightweight Fish Scale is a good fit when you want a compact, rechargeable scale for catches up to 55 pounds, plus a backlit display and simple three-weight memory. Skip it if verified water resistance, a built-in tape, a lip gripper, or expanded tournament memory is essential. Its portability is the main strength, while the limited memory and lack of a stated water-resistance rating are the main tradeoffs.