The Bernardo CW 500 hook dynamometer is a weighing instrument for suspended loads with a maximum capacity of 500 kg and a measurement accuracy of 0.2 kg. Dimensions H 315 mm × W 430 mm × C 540 mm, weight approx. 5 kg. It is directly applied to hoists, cranes, and lifting systems to weigh the suspended load in real-time, with a digital LED display for immediate reading. Suitable for warehouses, workshops, loading/unloading sites, and checking loads on jib cranes or winches. Distributed in Italy by Krollit as an official Bernardo distributor since 2007.
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Maximum load: 500 kg
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Measurement accuracy: 0.2 kg
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Percentage resolution: ~0.04%
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Dimension A (height): 315 mm
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Dimension L (width): 430 mm
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Dimension C (hook development): 540 mm
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Instrument weight: approx. 5 kg
Who uses the CW 500 and for what
The Bernardo CW 500 is an electronic hook dynamometer designed for weighing suspended loads up to 500 kg with an accuracy of 0.2 kg (approximately 0.04% of full scale). The typical application is in-line suspension with hoists, jib cranes, winches: the instrument is placed between the lifting system and the load to read the actual weight lifted in real-time. For weighing packages, containers, mechanical components, and light materials in artisan workshops and small-medium warehouses. The large-digit LED display allows weight readings even from a distance during loading operations, a crucial feature for construction site applications or warehouses with reduced visibility. The typical battery life is 50-70 hours of actual use. In Krollit customers' laboratories, the CW 500 is chosen by mechanical workshops for checking the weight of lifted parts, logistics warehouses for weighing suspended packages, carpentry shops for verifying the weight of structures, and construction sites for checking loads during crane handling.
Its place in the Bernardo range
The Bernardo CW hook dynamometer range is organized into 7 models ordered by capacity and accuracy: CW 500 (500 kg, ±0.2 kg), CW 1000 (1,000 kg, ±0.5 kg), CW 2000 (2,000 kg, ±1 kg), CW 3000 (3,000 kg, ±1 kg), CW 5000 (5,000 kg, ±2 kg), CW 10000 (10,000 kg, ±5 kg), CW 15000 (15,000 kg, ±5 kg). Absolute accuracy decreases with increasing capacity, but percentage accuracy remains constant (approximately 0.03-0.05% of full scale).
The CW 500 model is entry/mid-range. For workshops with typical loads under 800 kg, the fine accuracy (0.2 kg) is correctly sized. For larger loads, choose higher models: CW 2000 for up to 2,000 kg, CW 3000 for up to 3,000 kg, etc.
Difference from the Bernardo ID series: CW are electronic dynamometers FOR WEIGHING; ID are mechanical hooks FOR LIFTING (without weight measurement). For mixed lifting + weighing applications, use a CW; for lifting only, IDs are significantly more economical.
Krollit Logistics and Support
Bernardo shipping in 5-9 business days (7 days for Southern Italy). With a weight of approx. 5 kg, it is shipped in individual protective packaging and easily handled by one person. Chains, ropes, slings, complementary accessories, and original Bernardo spare parts are available from stock with shipping in 3-5 business days. EN 1677 conformity documentation (for ID hooks) or instrument calibration documentation (for CW dynamometers) included in the package. Customer support available in Italian.
Who the CW 500 is for
| Profile |
Compatibility |
Reason |
| Passionate hobbyist |
Adequate |
Professional tool; for hobby use, it is oversized unless for specific applications involving lifting heavy loads. |
| Mechanical workshop with parts weight control |
Recommended |
Real-time weighing during lifting to verify the actual weight of parts. ±0.2 kg accuracy suitable for standard workshop loads. |
| Logistics warehouse with hoists/cranes |
Recommended |
For weighing suspended packages before loading/unloading. LED display visible from a distance, 50-70 hours of actual use battery life. |
Not suitable for: applications with loads exceeding 500 kg (risk of instrument damage); applications requiring accuracy greater than 0.2 kg (consider smaller capacity models in the same CW series); environments with continuous vibrations (digital reading may fluctuate; the instrument is designed for static weighing); environments with extreme temperatures outside the typical -10/+40°C range of industrial electronic instruments; applications requiring legal metrological certification (initial factory calibration, but not legal certification for commercial weight-based transactions).
Weighing capacity
| Specification |
Value |
| Maximum load (capacity) |
500 kg |
| Measurement accuracy |
0.2 kg |
| Percentage resolution (% full scale) |
~0.04% |
Dimensions and weight
| Specification |
Value |
| Dimension A (height) |
315 mm |
| Dimension L (width) |
430 mm |
| Dimension C (hook development) |
540 mm |
| Instrument weight |
approx. 5 kg |
Compliance
| Specification |
Value |
| Marking |
CE |
| Directive |
Measuring instruments for industrial use |
Standard equipment
- Bernardo CW 500 hook dynamometer
- Large-digit digital LED display
- Integrated rechargeable batteries
- Mains charger
- Initial factory calibration documentation
- User manual in Italian
Frequently Asked Questions
What is the difference between the CW 500 and a bench scale?
The hook dynamometer weighs suspended loads (suspended from hoists, cranes, winches); a bench scale weighs loads placed on it. These are instruments for completely different applications: the dynamometer is essential where the load cannot be placed down (large packages, motors, materials suspended during handling).
The hook dynamometer is placed between the lifting system and the load: the upper hook attaches to the hoist, the lower hook to the load. The internal load cell measures the pulling force and converts it into a weight displayed on the LED screen. For static applications on a balance, a bench/floor scale is the correct choice.
Is the instrument certified for commercial use (weight-based transactions)?
No, the CW 500 is an industrial instrument factory calibrated but NOT metrologically certified for commercial use (purchase/sale transactions by weight). For commercial use, MID (Measuring Instruments Directive) certification issued by an accredited body is required.
For internal industrial applications (checking part weights, verifying loads, internal logistics weighing), factory calibration is sufficient. For commercial applications (selling materials by weight, invoicing based on weight), MID certification with a green 'M' label and official metrological stamp is mandatory: contacts are available from certifying bodies like INRIM or equivalents.
How long does the battery last in daily use?
Typical battery life is 50-70 hours of actual continuous use. In daily artisan use (10-30 minutes per day), the battery lasts 2-4 weeks before requiring recharging.
Integrated rechargeable batteries can be replaced by an authorized Bernardo service center. For intensive continuous use, a mains charger should always be available in the workshop, or the instrument should be kept charged when not in use. The auto-shutdown mode after inactivity significantly extends battery life.
Is the ±0.2 kg accuracy (0.04% of full scale) truly significant?
For standard industrial applications, yes. At a maximum load of 500 kg, the relative error is approximately 0.04%. For typical working loads (50-80% of full scale), the relative error is slightly higher but remains below 0.1%.
For checking the weight of industrial parts (motors, mechanical components, crates), the ±0.2 kg accuracy is correctly sized. For applications requiring higher absolute precision (e.g., weighing jewelry, high unit value materials), laboratory dynamometers or precision balances are recommended, not industrial instruments.
How does the periodic calibration procedure work?
For standard industrial use, annual periodic verification with certified standard weights is recommended. The instrument allows correction of the calibration factor using the procedure outlined in the manual.
Periodic verification can be done in the workshop with standard weights of adequate capacity (e.g., a 100 kg standard weight for the CW 500). For formal annual certification, contact ACCREDIA-accredited calibration centers or equivalents. For internal industrial control use, the initial factory calibration is sufficient for most application cycles.
