Measurements – Central Science Supplies https://centralscience.spiderns.com School and College Science Supplies Tue, 13 Oct 2026 17:19:21 +0000 en-GB hourly 1 https://wordpress.org/?v=7.1.3 Newtonmeter DEMO DIGITAL 20 N / 2000 g https://centralscience.spiderns.com/product/newtonmeter-demo-digital-20-n-2000-g/ https://centralscience.spiderns.com/product/newtonmeter-demo-digital-20-n-2000-g/#respond Tue, 13 Oct 2026 17:19:21 +0000 http://centralscience.spiderns.com/product/newtonmeter-demo-digital-20-n-2000-g/ Featuring force measurement over a minimum of distance, yet with a high degree of precision,
and a 26 mm digital display, making this device especially “simple, easy and safe” to use.
Demonstration instrument with magnetic holder for measuring force (in newtons) or mass (in grams).

The easy-to-read LED display (H = 26 mm) and the external sensor in a rugged case of rectangular tubing make it an ideal instrument for mechanics experiments, particularly when used with a magnetic panel.
Both tension and pressure can be measured.
By means of a support rod (D = 10 mm) the sensor can be fastened to common stands.

TECHNICAL DATA:
Measuring range ?N?: 20 N, resolution: 0,01 N
Measuring range ?mN?: 2000 mN, resolution: 1 mN
Measuring range ?kg?: 2 kg, resolution: 1 g
Measuring range ?g?: 200 g, resolution: 0,1 g

Zero compensation (tare): manual, by means of adjustment knob
Accuracy: better than 0.5 %

Power supply: 4 x 1.5 V mignon cells (included) or external power supply 6 V / 500 ma Not included
Dimensions: approx. 160 x 120 mm

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UNIVERSAL MULTIMETER DEMO II https://centralscience.spiderns.com/product/universal-multimeter-demo-ii/ https://centralscience.spiderns.com/product/universal-multimeter-demo-ii/#respond Tue, 13 Oct 2026 17:16:58 +0000 http://centralscience.spiderns.com/product/universal-multimeter-demo-ii/ Durable servo-controlled measuring instrument to measure current
and voltage with high precision;
can be used in any position, for example vertically or horizontally for projection.

The large scale with an arc length of approx. 200 mm,
the wide signal-coloured pointer and the 26 mm high digits
guarantee a hassle-free reading of the measured values even from greater distances.
The LED display indicates the unit of measurement and current type
and is also clearly visible from the distance.

An internal electronic overload protection eliminates the annoying
and time-consuming change of fuses. The meter can also be used as a
sensitive galvanometer (measuring range 1 mV-) thanks to the built-in amplifier.
Pointer setting: Zero at left or at midpoint
Four insertable double scales: 1/3 – 10/30 – 100/300 – -5 to +5/-15 to +15 (included)
Measuring ranges:
DC voltage: 1 mV, 1 to 30 V
AC voltage: 1 to 30 V
DC and AC amperage: 100 ?A to 10 A
Rear panel with neodymium magnets for a stable magnetic mounting;
Battery compartment for easy replacement of batteries.

Technical data
Type of instrument: Moving-coil instrument
Internal resistance: R = 100 kOhm / V
Accuracy: Class 2 ? 3
Working position: vertically or horizontally
Measuring inputs: 4 mm safety socket
Fuses: internal electronic overload protection
Power supply: four 1.5 V batteries (included)
or 2.5 mm hollow DC jack for 6 V external power supply
Housing: ABS plastics
Dimensions: 268 x 92 x 226 mm
Mass (with scales): 1857

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Portable Wattmeter Demo Unit https://centralscience.spiderns.com/product/portable-wattmeter-demo-unit/ https://centralscience.spiderns.com/product/portable-wattmeter-demo-unit/#respond Tue, 13 Oct 2026 17:08:01 +0000 http://centralscience.spiderns.com/product/portable-wattmeter-demo-unit/ Discover Precision with Our Portable Wattmeter Demo Unit – Get Yours Now!
Explore the world of precise power measurement with our Portable Wattmeter Demo Unit. This demonstration instrument is designed for measuring power in low-voltage circuits and offers remarkable ease of transport and magnetic mounting capabilities. With a 26-mm LED display showcasing measured values and a 20-mm LED display for measurement units, it ensures accurate readings even from a distance. Take control of your power measurements and get your unit today!

Key Features of the Portable Wattmeter Demo Unit:

  • High-Precision LED Display: The unit boasts a 3 1/2-digit LED display with a digit height of 26 mm. This high-precision display ensures that users can obtain accurate power measurements with ease. Whether you’re measuring power for educational demonstrations or engineering applications, the LED display provides clear and reliable readings.
  • Easy Connectivity: To streamline the measurement process, the unit comes equipped with 4-mm safety jacks, making it effortless to connect to low-voltage circuits. This feature is particularly valuable in educational settings where students can quickly set up experiments and learn about power measurements.
  • Measurement Versatility: Our Portable Power Measurement Unit offers versatile measurement capabilities, including true power (W) and work/energy (Ws). This versatility enables users to tackle a wide range of measurement tasks, from assessing the power consumption of electronic devices to quantifying energy usage in circuits.
  • Wide Measurement Limits: With measurement limits of up to 20 Veff and 2 Aeff, this unit can handle various low-voltage circuit measurements. It accommodates a range of scenarios, ensuring that it meets the diverse needs of users across different applications.

Dimensions:

  • Specific dimensions may vary based on the unit model.

Our Portable Power Measurement Unit is the ideal tool for precise power measurement in low-voltage circuits. With its high-precision LED display, easy connectivity, versatile measurement capabilities, and wide measurement limits, it empowers users to obtain accurate power readings effortlessly. Whether you’re a professional in need of precise measurements or an educator looking to demonstrate power concepts, this unit is your solution.

Notes:

  • Please note that this unit is intended exclusively for educational purposes and is not suitable for commercial use.
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Coulombmeter Digital https://centralscience.spiderns.com/product/coulombmeter-digital/ https://centralscience.spiderns.com/product/coulombmeter-digital/#respond Tue, 13 Oct 2026 17:05:29 +0000 http://centralscience.spiderns.com/product/coulombmeter-digital/ The Coulombmeter Digital: A valuable tool for fostering a deeper understanding of fundamental electrical principles.

The Coulombmeter Digital is useful for a wide range of experimental applications including charging by induction, Faradays ice pails, Coulomb’s law and capacitance of an isolated sphere.

Features of the Coulombmeter Digital: 

– The 3½ digit liquid crystal display has 13mm high digits with a wide field of view unobscured by trailing leads.
– The display also provides indication of polarity and low battery.
– The unit is exceptionally easy to read.
– Two colour coded 4mm sockets are located on the sides for maximum convenience and anti-slip feet are fitted to the base.
– Low operating current gives expected battery life in excess of 500 hours.
– Housed in a robust, ABS plastic case. Supplied with charge plate, battery and instructions.

A document containing descriptions of a number of standard experiments and investigations which can be performed using this Digital Coulombmeter has been compiled by us.

Specifications: 

Description : Coulombmeter
Electrical Supply : 9V
Battery, type: PP3
Dimensions : 130 x 60 x 90mm overall
Mass : 0.20kg
Range : 0 to 1999nC
Resolution : 1nC
Overload : 10 x full scale
Accuracy : ±10% of full scale
Input Resistance : 100GΩ
Leakage Current : 1pA (10pA max.)
Charge Storage : 4.7µF

The device features a user-friendly interface with easy calibration options, ensuring quick setup and consistent results. Its robust design makes it suitable for frequent use in classrooms or laboratories. Some models may also include a rechargeable battery and data output capabilities, allowing seamless integration with computers for further analysis. The Digital Coulombmeter is a valuable tool for fostering a deeper understanding of fundamental electrical principles.

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Ohmmeter demo unit https://centralscience.spiderns.com/product/ohmmeter-demo-unit/ https://centralscience.spiderns.com/product/ohmmeter-demo-unit/#respond Tue, 13 Oct 2026 17:03:27 +0000 http://centralscience.spiderns.com/product/ohmmeter-demo-unit/ Demonstration meter for measuring resistance and for testing diodes, the component to be measured is connected to the two 4-mm safety jacks, this instrument is easy to transport
and can be mounted magnetically, the 26-mm LED display showing the measured value and the 20-mm LED display for the measurement unit allow readings to be taken easily even at a distance

TECHNICAL DATA:
Display: 3 1/2-digit LED display, digit height 26 mm
Measuring ranges: 200 Ohms, 2, 20, 200, kOhms, 2 MOhms, 2 V (diode testing)
Accuracy: ?0.2 % ?1 digit for all ohmage ranges up to 200 kOhms, beyond that

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ELECTROSCOPE DIGITAL DEMO UNIT https://centralscience.spiderns.com/product/electroscope-digital-demo-unit/ https://centralscience.spiderns.com/product/electroscope-digital-demo-unit/#respond Tue, 13 Oct 2026 16:51:33 +0000 http://centralscience.spiderns.com/product/electroscope-digital-demo-unit/ Demonstration meter for measuring high electrostatic voltages, unlike mechanical electroscopes, this instrument delivers exact and clear quantitative readings as well as the polarity of the charge, the value measured can be frozen using the hold switch, this instrument is easy to transport and can be mounted magnetically, the 26-mm LED display allows readings to be taken from a distance

TECHNICAL DATA:
Display: 2 1/2-digit LED display, digit height 26 mm
Measurement input provided by means of specially insulated 4-mm safety jacks
4-mm safety jack for ground connection
Measuring range: 0 … 18.0 kV
Reset button for resetting instrument to zero
Accuracy: better than 2 % for 0 … 10 kV
Throw switch: ON/OFF
Throw switch: measure sample – freeze measured value (hold)
Power supply: 4 x 1.5 V mignon cells (included) or 5.5-mm hollow DC jack
for 6 V/500 mA external power supply (not included)
Case: green ABS plastic with yellow labelling
Dimensions: approx. 160x120x45 mm, weight: approx. 483 g

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Robust Portable Analog Multimeter https://centralscience.spiderns.com/product/robust-portable-analog-multimeter/ https://centralscience.spiderns.com/product/robust-portable-analog-multimeter/#respond Tue, 13 Oct 2026 16:37:20 +0000 http://centralscience.spiderns.com/product/robust-portable-analog-multimeter/ Explore the Robust Portable Analog Multimeter Features for Precise Measurements!
When it comes to precise electrical measurements, the Robust Portable Analog Multimeter stands out with its exceptional features and durable design. This portable measuring device for voltage and current, available for both DC and AC, is the ideal tool for professionals and enthusiasts alike. Discover the exceptional capabilities that set this analog multimeter apart!

Key Features of the Robust Portable Analog Multimeter:

  • Electronic Overload Protection: This analog multimeter is equipped with electronic overload protection, featuring an indicator light for all measuring ranges. Say goodbye to melted fuses!
  • Large and Robust Design: The multimeter boasts a large and robust design, complete with a holster for added durability.
  • Easy-to-Read Display: Thanks to its inclined design, the multimeter offers an easy-to-read display for effortless measurements.
  • Transparent Base with Handle: The transparent base comes with a recessed handle, allowing you to hold the device with one hand comfortably.
  • Versatile Voltage and Current Measurements: This portable device handles voltage and current measurements for both DC and AC, making it highly versatile.
  • Wide Voltage and Current Ranges: It offers a wide range of AC/DC voltage and current measurements, ranging from 1 mV to 30 V for voltage and 100 ?A to 10 A for current.
  • Arc Scale Length: The arc scale length is approximately 90 mm, ensuring accuracy in your readings.
  • Thermal Voltage and Induction Measurement: With a 1 mV upper value range, it’s perfect for measuring thermal voltage or induction without a preamplifier.
  • Exceptional Frequency Response: The multimeter boasts an exceptional frequency response, typically -1.5 dB at 20 kHz, allowing direct measurement of resonant circuits.
  • Large Mirrored Scale: The mirrored scale is large and easy to read, with clear markings for precise measurements.
  • High Accuracy: With typically 1.5% accuracy, you can rely on this multimeter for precise results.
  • Durable Selection Switch: The multimeter features a durable selection switch for easy operation.
  • 10 A Range with Separate Input Socket: For high current measurements, it includes a 10 A range with a separate input socket.
  • Zero at Midpoint: You can easily select zero at the midpoint using the switch.

Dimensions:

The multimeter’s dimensions are approximately 200 x 140 x 100 mm.

Weight: It weighs approximately 675 g, making it highly portable and easy to carry to various work locations.

The Robust Analog Multimeter is a versatile and durable measuring tool suitable for professionals and enthusiasts. Its electronic overload protection, wide measurement ranges, and exceptional features make it an essential part of any toolkit.

Notes: Please note that this multimeter is intended for educational and professional purposes. Always follow safety guidelines when working with electrical circuits.

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Scales for Multimeter demo II, transparent, set of 8 https://centralscience.spiderns.com/product/scales-for-multimeter-demo-ii-transparent-set-of-8/ https://centralscience.spiderns.com/product/scales-for-multimeter-demo-ii-transparent-set-of-8/#respond Tue, 13 Oct 2026 15:42:36 +0000 http://centralscience.spiderns.com/product/scales-for-multimeter-demo-ii-transparent-set-of-8/ Transparent inserting-scales; acrylic;
for universal multimeter demo II ESP60249
Ranges: 0-1, 0-3, 0-10, 0-30, 0-100, 0-300, -5 to +5, -15 to +15

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LUXMETER https://centralscience.spiderns.com/product/luxmeter/ https://centralscience.spiderns.com/product/luxmeter/#respond Tue, 13 Oct 2026 15:35:39 +0000 http://centralscience.spiderns.com/product/luxmeter/ Display: 3 digits, big LCD, max display 1999.
Wide range: from 0.1 Lux to 200,000 Lux
Accurate test, fast response, and auto zero-adjustment.
Data hold: hold the current test result.
Symbol and unit display, easy to read.
Low battery indicator and auto power off.
Range: 0-200,000 Lux
Basic Accuracy: ≈ 4%
Repeat-ability: ≈ 2%
Temp characteristic: ≈ 0.1 %/ °C
Max. Display: 1999
LCD Size: 67x40mm
Battery: 9V (6F22)
Dimension: 130x95x30mm

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Interactive Hygrometer Demo Unit https://centralscience.spiderns.com/product/interactive-hygrometer-demo-unit/ https://centralscience.spiderns.com/product/interactive-hygrometer-demo-unit/#respond Tue, 13 Oct 2026 14:48:45 +0000 http://centralscience.spiderns.com/product/interactive-hygrometer-demo-unit/ Explore Humidity Dynamics with the Interactive Hygrometer Demo Unit
Unveil the mysteries of humidity and its impact on hygrometers with our Interactive Hygrometer Demo Unit. This innovative educational tool offers a straightforward and engaging approach to understanding how humidity affects pointer deflection in a hygrometer. By placing the hygrometer in an air-tight, transparent plastic box along with a container of hot water, students can witness the direct relationship between humidity levels and pointer movement. Join us on this educational journey as we delve into the world of humidity measurement, making learning both fun and informative.

Key Features of the Interactive Hygrometer Demo Unit:

  • Realistic Hygrometer: Our Humidity Demo Unit includes a genuine hygrometer capable of measuring humidity levels across the entire spectrum, from 0% to 100%. This authenticity ensures that students can explore and grasp the full range of humidity values, promoting a comprehensive understanding of the subject matter.
  • Transparent Plastic Boxes: We provide both large and small transparent plastic boxes as integral components of this educational kit. These boxes serve as controlled environments in which students can conduct experiments and directly observe how humidity levels influence the behavior of the hygrometer. The transparency of the boxes allows for clear visualization, facilitating effective learning.
  • Hot Water Container: To facilitate engaging experiments, we’ve included a small container designed for holding hot water. This component plays a pivotal role in the demonstration by enabling students to manipulate humidity levels swiftly and precisely. By adding hot water to the container and sealing the box, they can witness humidity changes in real-time, as indicated by the hygrometer’s pointer deflection.
  • Interactive Learning: The Humidity Demo Unit is designed to foster interactive and hands-on learning experiences. It encourages students to actively participate in experiments, ask questions, and draw conclusions based on their observations. This approach promotes a deeper comprehension of the principles of humidity measurement.
  • User Manual: We provide a user manual that offers clear and comprehensive instructions on setting up and conducting experiments with the Interactive Humidity Demo Unit. This resource ensures that both educators and students can make the most of this educational tool, enhancing the overall learning experience.
  • Versatile Educational Tool: Our demo unit is adaptable to various educational settings, from classrooms to science laboratories. It aligns with curriculum requirements and can be seamlessly integrated into lesson plans, making it an invaluable resource for teachers and instructors.
  • Promotes Critical Thinking: By engaging with this interactive tool, students are encouraged to think critically and analytically. They can formulate hypotheses, design experiments, collect data, and draw conclusions—an essential skill set for scientific inquiry.
  • Practical Application: Understanding humidity and its measurement is not only educational but also applicable in real-life scenarios. This knowledge equips students with valuable insights that can be applied in fields such as meteorology, environmental science, and industrial processes.
  • Safe and Controlled Experiments: The design of the Humidity Demo Unit prioritizes safety. The use of transparent plastic boxes ensures that experiments are conducted in a controlled and secure environment, preventing unintended consequences.
  • Engaging and Informative: Beyond its educational value, this kit is designed to make learning about humidity enjoyable and informative. It transforms what could be abstract concepts into tangible, observable phenomena, sparking curiosity and fostering a lifelong interest in science.

Dimensions:

  • The dimensions of the hygrometer and plastic boxes are designed to fit standard educational settings. Specific measurements can be found in the user manual.

The Interactive Humidity Demo Unit is a valuable educational tool designed to enhance students’ understanding of humidity and its effect on hygrometers. With a real hygrometer, transparent plastic boxes, and a hot water container, this kit encourages hands-on learning and engagement.

Notes: This educational demo unit is intended solely for educational purposes, providing a safe and interactive platform for students to explore the principles of humidity measurement.

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