These little PC-mount SPDT momentary switches from Omron® are rated for up to 0.1A at either 125VAC or 30VDC. Measures 3/4" x 1/4" x 1/4" with a 1-1/4" lever. UL/CSA.

Ten electrical leads with an alligator clip on each end. Each lead is about 20" long, not counting the 'gators. Vinyl coated 20-22 ga. wire with a vinyl cover over each clip. They come in an assortment of five colors with two leads in each color. The manufacturer calls them heavy duty but we would restrict them to the light currents and low voltages you will be using in your home experiments. Our each is a set of (10).

This 5-pin socket is already wired with 9" leads in black, red, white, yellow and blue to its quick-disconnect sockets, ready for your 1/4" or 7mm spade terminals. Housing is slotted so you can interlock them end to end. Measures 1-1/4" x 1-1/16" x 1" thick. Matches our 94746 relay.

Really big stake. Circus tent size, or serious tree tie-down. Measure 20" long in heavy duty orange plastic with vicious cross-barbs and a 2-3/8” dia x 1-1/2” head with a side clip and 1” bore for thick ropes. Stand it on its head and it looks like a Romulon model holiday tree. Also good for driving through the heart of a plastic vampire.

These large momentary SPDT push-button switches are rated 10A at 125/250VAC and are mounted to a 2-7/16"dia lens plate with a 1-1/8" long x 15/16 - 2 shaft that comes with a plastic washer and nut. There's also an internal 12V 3W replaceable indicator bulb. Needs 3" of rear clearance. You pick a red, green or yellow lens.

Pardon us--just a little machinists’ joke. This sturdy cast-iron pillow block measures 5" x 2-3/8" tall x 1-3/8". Has a sealed 1-3/4" dia bearing with a 3/4" ID x 1-7/32" bushing and a pair of set screws. Mounts via 7/16" x 13/16" x 1/2" slots in the base. Has a 1/4” lube fitting with a cover. Get a couple and add a 3/4” dia steel rod, and you’ve got the toughest towel bar in the universe.

Remember those old school vibration football games, or those fantastic days-of-yore vibrating beds in roadside motels? This is like that, a small vibration motor (10mm dia x 2.5mm) that’s touch-sensitive and produces a pleasant buzzy response. Motor has 1-1/4" power leads, draws approx 60mA at 3VDC. Has 0.75g vibe amplitude. Self-adhesive pad on one face. No shaft.

These 3” long cricket-shaped clips are made to slide onto your car visor and open up to hold your glasses without scratching the plastic lenses they told you were scratch-proof but really aren’t. Inside has foam pads so they won’t even scratch your temples. We’ll pick a pair in black, red, blue or fuchsia. Could also hold a pencil if you don’t have sunglasses. Made for a large chain store and sold for $5.99 each, but we’ve got ’em for a fraction of that. Surplus!

Drink like your grandfather did when he was in service to Uncle Sam, from this brand new aluminum canteen nested in a cup with folding handles, both inside a padded cotton olive drab cover (suitable for soaking to keep the water cold) with a pistol belt hook on the back. Canteen holds (1) quart, the cup about half that. Includes a black screw cap with a (non-GI) chain and carabiner.

Now comes this ball of geometric possibilities, from creativity guru Roger von Oech. Perfect for anyone with a 3-dimensional mind, from a precocious child to a bored nonagenarian, including your favorite artist, mathematician, designer, engineer, or whatever. The little red ball, 3-1/4" dia, comprises (30) magnetized right golden rhombic pyramids that will fit together in endless shapes, from a rhombic triacontahedron (see the pic), to stars, wreaths, animals, sunbursts, and endless others. Comes with a 96pp booklet on geometric possibilities and creativity. Plenty of desktop noodling fun, but a lot more than just a toy.

Doesn’t happen much, but it’s a subtle transition. This thick-walled clear glass bottle stands 8-3/8” tall and holds 8 oz (230ml, about). Measures 1-7/8” square at the bottom and rounds up to shoulder about 1-1/2” below the black-plastic, gasketed screw cap.

The world has enough moist towelettes, if you ask us. Instead, try this dry and super-compressed reusable cotton towelette. Starts life as a pocket/purse-friendly 2-3/8” dia x 3/4” thick disk, but add water and the PopUp Towel grows to a jumbo 22” x 12”, large enough to scrub up a good-sized third grader.

You don’t, huh? They’re called acid brushes because once upon a plumber they were used to apply acid flux to pipes for soldering. Now they’re just the cheap, disposable brushes with hollow aluminum handles you see in glue pots and everywhere else folks need to slather on goopy stuff. Measure 6" long with 5/8” wide bristles.

Little takeout 3-6VDC Mabuchi motors (6VDC nominal) spin approx 4000 rpm and draw 50mA no load. Stall at 300mA and measure 1-1/2" long x 1-1/16" dia with a 1/2” long x 3/32” dia shaft with a 2-sheave 9/16” dia pulley. Sheaves are 1/16” ID. Wired with 2” leads for super easy battery or wall adapter hook up. These were originally from copiers so you'll want to wipe 'em down before use.

These 3-1/4" dia magnifying glasses on 5” handles are a big step up from the traditional Holmesean versions. Acrylic 1.5X lenses are surrounded by a trio of super-bright white COB LEDs for improved clue detection. (Holmes would have killed for COB lights.) They run on (2) “AA”s, thoughtfully included. We’ll pick one in a color that will complement your deerstalker.

The correct answer is "I don't know; I've never toggled." If, however, you just want to turn something on and off, here's a choice of toggles for your switching delectation. The DPDT toggle is rated for up to 20A at 125VAC and has screw terminals below. Measures 1-1/4" x 1-3/4". No center-off position. The first DPST toggle is rated for 20A at 125VAC or 15A at 250VAC. Screw terminals on the bottom. Measures 1-5/16" x 3/4". The smaller DPST toggle is rated for up to 4A at 125VAC or 2A at 250VAC. Has 3/16" spade terminals on the bottom and measures 1" X 9/16". All the toggles come with switch-plates and mounting nuts.

Here's a brand new selection of sealed lead-acid rechargeable batteries, for when you're pushing something a little bigger than a penlight. All batteries are all direct from the manufacturer with current date codes. All of them have (2) 3/16" wide quick-disconnect terminals on top. Click on battery description for a photo.

From Engino®, this 180-piece robotics teaching kit includes instructions for building (8) robots (4 included; 4 online) using their ERP (Engino® Robotics Platform) software for control, with pre-recorded and manual programming. Includes (2) 23-page manuals to get you started, plus (2) motors, (2) infrared sensors, a controller, interface cables and a slew of snap-together parts and pieces. Works with Windows Vista, XP, 7, 8 and 10, but not Mac. You add a trio of “AAA”s. Designed for teaching ages 8-16+.