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Alligator Clip
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Price: $0.88
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Sparkfun Item #: PRT-00111 -

A staple for the electrical engineer. I can't tell you how many times I've been one clip short! Note: Sold as a single unit.

Analog Panel Meter - 0 to 5 VDC
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Price: $9.27
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Sparkfun Item #: TOL-10285 -

This analog panel meter measures DC voltage from 0-5 volts with 2.5% accuracy. It has a clear and easy to read scale and an adjustable dial. These come in handy for measuring the output of sensors with 5V ranges. The face of the meter is 45x45mm overall. The mounting hole should be 38mm. The overall depth of the meter is 35mm. Documents: Product Sheet

Digital LED Voltmeter
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Price: $3.15
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Sparkfun Item #: PRT-14313 -

This Digital LED Voltmeter measures the voltage at a particular point of the system it has been hooked up to and then provides a readout on its three 7-segment LEDs. This voltmeter is able to provide a readout of voltages from 2.5VDC to 30VDC within a 1% accuracy. Features: Range: 2.5VDC --- 30VDC Display: Three 0.28" Red 7-Segment LEDs Refresh Rate: ~1sec Accuracy Within 1%

Heatsink Compound
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Price: $5.30
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Sparkfun Item #: PRT-09599 -

This is a 5g syringe of white heatsink compound (aka thermal grease, thermal paste, thermal goo). Use this whenever you're connecting a component to a heatsink, it'll really help to dissipate even more potentially damaging heat. This compound is composed of 50% silicone, 20% carbon, and 30% metal oxide. It has a thermal conductivity of 1.172 W/(mK), which should be plenty for voltage regulators, MOSFETs, motor drivers, audio amplifiers, etc. Features: Color: White Thermal Conductivity: 1.172...

Heatsink TO-220
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Price: $1.77
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Sparkfun Item #: PRT-00121 -

Small heat sink for TO-220 components. Ideal for keeping your 5V and 3.3V regulators running cool. Black anodized bolt on type with 2.5W dissipation.

Medium Heatsink
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Price: $3.31
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Sparkfun Item #: PRT-14340 -

This is a medium-sized heatsink that has been designed to dissipate heat away from your boards and ICs. Each of these black anodized heatsinks is perfect when used in conjunction with our ESP32 Thing Power Control Shield, but it also fits the TO-220 package. Documents: Dimensional Drawing

Monocle Magnifier - Illuminated
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Price: $17.57
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Sparkfun Item #: TOL-09316 -

When working with small parts, sometimes you need magnification and some extra light. This is a monocle we use regularly in our production facility. It has a 10x lens with a working distance of about 1-1/2". The 1" diameter eye piece fits snugly around your eye with a 15" aluminum-core headband. The LED provides sufficient light at the working distance. This loop magnifier set itself apart in our eyes because of the little LED on the side. Trying to view SMD connections is hard enough - the...

Polymorph - 1000g
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Price: $61.70
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Sparkfun Item #: TOL-10951 -

Polymorph is a non-toxic, biodegradable polyester with a low melting temperature of about 60°C (140°F). Prototype plastic parts can be made by simply heating the plastic beads in hot water until they turn clear and then kneading them together and shaping by hand. When it cools it becomes a nylon-like white plastic. Polymorph can be re-used by simply re-heating and re-shaping. Plastic beads are supplied in a re-usable plastic container. So what do you do with it? Robotics, small-parts...

Polymorph - 250g
Price: $17.96
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Sparkfun Item #: TOL-10950 -

Polymorph is a non-toxic, biodegradable polyester with a low melting temperature of about 60°C (140°F). Prototype plastic parts can be made by simply heating the plastic beads in hot water until they turn clear and then kneading them together and shaping by hand. When it cools it becomes a nylon-like white plastic. Polymorph can be re-used by simply re-heating and re-shaping. Plastic beads are supplied in a heat-sealed plastic bag to prevent spillage during transport. So what do you do with...

Small Heatsink
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Price: $4.24
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Sparkfun Item #: PRT-11510 -

These tiny little black anodized heatsinks are perfect for cooling off small surface-mount components such as the Allegro A4983 stepper driver. **Note: **We ship these as singles Features: 0.19x0.25x0.30" Documents: Datasheet

Thermoelectric Cooler
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Price: $21.10
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Sparkfun Item #: COM-15082 -

Thermoelectric coolers (TEC or Peltier) create a temperature differential on each side. One side gets hot and the other side gets cool. Therefore, they can be used to either warm something up or cool something down, depending on which side you use. You can also take advantage of a temperature differential to generate electricity. The thermal tape listed below works very well to attach heat sinks to the hot side. This Peltier works very well as long as you remove the heat from the hot side....