Test leads and probes

Klein Tools Heavy-duty clip leads, 18 AWG, 3 ft

A clip-only lead in 18 AWG — the one set here that tells you the size of the wire inside it.

Klein Tools 69381 heavy-duty alligator clip test leads

Klein Tools Heavy-duty clip leads, 18 AWG, 3 ft

A clip-only lead in 18 AWG — the one set here that tells you the size of the wire inside it.

Stated rating: CAT III 1000 V / CAT IV 600 V, stated. The same pairing as the two other Klein sets, and the three of them are the only CAT IV items on this shelf. This shelf's introduction explains the arithmetic: the rated pair is the lower of meter and leads
Insulation: 18 AWG DOUBLE INSULATED WIRE, stated — and the gauge is what makes this listing unusual. No other product on this shelf publishes a wire gauge at all. What it does NOT say is the material: not silicone, not PVC, just double insulated, as on both other Klein sets
Plugs and tips: Banana plug at one end, HEAVY-DUTY ALLIGATOR CLIP at the other, right-angle at the plug. There is no probe tip: this is a clip-only lead, which is a different purchase from the 69410 beside it where the clips unscrew. No shrouding is mentioned
Length: 3 feet, 91 cm — the shortest of the three Klein sets and the shortest stated lead on this shelf. Against the PUKAIBUL's 125 cm (49.2 in) and the published PeakTech's 120 cm (47.2 in), that is a third less reach
Stated application: INSULATION RESISTANCE TESTING, named in a bullet as "a perfect application for heavy-duty leads". That is a specific and sensible claim: an insulation test applies hundreds of volts between a conductor and earth for a minute at a time, which is a job for a clip that stays put rather than a probe held by hand
Supplied: One pair of universal right-angle leads with heavy-duty clips. The clips are not described as removable, which is the trade against the 69410: more clip, less versatility, same price to within two cents — $19.99 against $19.97
Amazon reference: B09YTDKDPQ
EAN: 0092644693816

Eighteen AWG published, alone on this shelf
CAT III 1000 V and CAT IV 600 V
Clips only — there is no probe tip

Best for: Insulation resistance testing and any reading you need to leave clipped on while you work

≈ $20

Check price on Amazon

Specifications

Stated rating: CAT III 1000 V / CAT IV 600 V, stated. The same pairing as the two other Klein sets, and the three of them are the only CAT IV items on this shelf. This shelf's introduction explains the arithmetic: the rated pair is the lower of meter and leads
Insulation: 18 AWG DOUBLE INSULATED WIRE, stated — and the gauge is what makes this listing unusual. No other product on this shelf publishes a wire gauge at all. What it does NOT say is the material: not silicone, not PVC, just double insulated, as on both other Klein sets
Plugs and tips: Banana plug at one end, HEAVY-DUTY ALLIGATOR CLIP at the other, right-angle at the plug. There is no probe tip: this is a clip-only lead, which is a different purchase from the 69410 beside it where the clips unscrew. No shrouding is mentioned
Length: 3 feet, 91 cm — the shortest of the three Klein sets and the shortest stated lead on this shelf. Against the PUKAIBUL's 125 cm (49.2 in) and the published PeakTech's 120 cm (47.2 in), that is a third less reach
Stated application: INSULATION RESISTANCE TESTING, named in a bullet as "a perfect application for heavy-duty leads". That is a specific and sensible claim: an insulation test applies hundreds of volts between a conductor and earth for a minute at a time, which is a job for a clip that stays put rather than a probe held by hand
Supplied: One pair of universal right-angle leads with heavy-duty clips. The clips are not described as removable, which is the trade against the 69410: more clip, less versatility, same price to within two cents — $19.99 against $19.97
Amazon reference: B09YTDKDPQ
EAN: 0092644693816

What the maker puts in writing

“SAFETY RATING of CAT III 1000V / CAT IV 600V”
“3-FOOT LONG 18 AWG double insulated wire”
“HEAVY-DUTY ALLIGATOR CLIPS attach to wires and other conductors”
“INSULATION RESISTANCE TESTING is a perfect application for heavy-duty leads”
“INCLUDES 1-PAIR of universal right-angle test leads with banana plug to heavy-duty alligator clip”
“DESIGNED BY ELECTRICIANS for electricians” · $19.99

NO insulation material. No jaw opening. No probe tip.

The only gauge on this shelf

Eighteen AWG.

Nothing else here — published or American, kit or pair — says how thick the copper is.

About a square millimeter. Substantial for a test lead, which is the whole claim behind “heavy-duty”, and the reason the listing points at insulation testing.

The trade is in the hand: a heavier conductor in a three-foot lead does not fold into a pouch as willingly as thin silicone.

Clips only, and they do not come off

Which is the choice between this and the 69410 beside it, two cents apart.

The 69410: probe pair, REMOVABLE clips, 104 cm (40.9 in). Both modes, one purchase.

This: clips, heavier, 91 cm (35.8 in).

If the reading is one you walk away from, the heavier jaw earns its place. If you want one set of leads for everything, buy the other.

Named for the job it is actually right for

“Insulation resistance testing is a perfect application for heavy-duty leads.”

An insulation tester puts 250, 500 or 1000 volts between a conductor and earth and holds it for up to a minute.

So the lead needs the voltage rating with margin — CAT III 1000 V — and you need to be nowhere near the probe end while it is live.

A clip you attach before energizing is the right end for that. A hand-held probe is not.

Three feet is the short end of this shelf

The PUKAIBUL gives 125 cm (49.2 in). The published PeakTech 120 cm (47.2 in). The 69410,104 cm (27326812.6 in).

This is 91.

On a consumer unit that is enough. Under a dashboard with the meter on the seat, it is not.

Availability

On sale at around 20 € on the American Amazon store at the time of checking.

Prices and availability are what Keepa reported on the date this page was updated; both move.

Prices quoted in this text were read on 8 October 2026. The live price is at the top of the page.

What gets asked here

Why publish a wire gauge?

Because it is the figure that decides how much current the lead can carry and how stiff it feels, and nothing else on this shelf gives one. Eighteen AWG is about a square millimeter of copper — substantial for a test lead, which is why the listing calls them heavy-duty, and the reason they suit insulation testing where a clip sits in place under voltage for a minute. The trade is handling: a heavier conductor in a three-foot lead is less willing to be folded into a pouch than a thin silicone one.

Is this or the 69410 the one to buy?

They are two cents apart and they are not the same tool. The 69410 is a probe pair with REMOVABLE clips: you get both modes from one purchase and 104 cm (40.9 in) of lead. This is clips only, in 18 AWG, at 91 cm (35.8 in), with heavier jaws. If you need a reading you can walk away from — an insulation test, a voltage watched while an engine cranks — the heavier clip is worth having. If you need one set of leads to do everything, the 69410 is the one.

What makes a lead right for insulation resistance testing?

The voltage and the time. An insulation tester applies 250, 500 or 1000 volts between a conductor and earth and holds it for up to a minute while the reading settles. That means the lead has to be rated for that voltage with margin — CAT III 1000 V here — and it means you want to be nowhere near the probe end while it is live. A clip you attach before energizing, and which will not fall off a terminal halfway through, is the right end for the job. A hand-held probe is not.

Instruments this fits

More test leads and probes

Klein Tools Right-angle lead set, CAT III 1000 V

A plain rated pair — and the rating is the whole point, because the three European sets on this shelf publish none.

Stated rating
CATEGORY III 1000 V AND CATEGORY IV 600 V, stated in a bullet. This shelf's introduction is explicit about why that matters: "fitting unrated leads to a CAT III meter gives you a CAT III meter with unrated leads, and the manufacturer's rating for the pair is the lower of the two". The three European sets previously on this shelf publish no category at all; this is one of three sets here that reach CAT IV
Insulation
NOT NAMED. The listing says the leads are durable and says nothing about silicone or PVC — and this shelf's introduction makes that comparison one of its five: silicone stays flexible in the cold where PVC goes stiff and cracks. All three Klein sets share the omission, which is odd on a product whose own description stresses that it is designed by electricians for electricians
Plugs and tips
Right-angle, "standard banana-type inputs compatible with most multimeters and clamp meters". No tip length is published and the plugs are not described as shrouded. A right-angle plug is the detail that keeps a meter from being levered off a ledge by its own leads, and it is why these fit Klein's own lead storage compartments
Length
41 inches, 104 cm, stated. That sits below the published PeakTech's 120 cm (47.2 in) and well below the PUKAIBUL's 125 cm (49.2 in) on this shelf, and above the 3 ft (91 cm) of the two other Klein sets
Supplied
One pair of universal test leads and one set of REMOVABLE alligator clips. Removable is the useful word: the clips come off, so one purchase covers a probe measurement and a hands-free one. 91 grams
Also stated
The leads "are compatible with and fit the lead storage compartment on most Klein test and measurement products" — which is a specification about the METER rather than the lead, and the only one of its kind on this shelf. Klein also offers insulation resistance testing as an application of its heavy-duty sibling, the 69381
Amazon reference
B003U2GONM
EAN
0092644694103
- CAT III 1000 V and CAT IV 600 V, both published
- Removable alligator clips in the same purchase
- The insulation material is never named
Best for: Replacing the leads on any meter with banana sockets, where the meter is rated and the leads must not drag it down

≈ $20
Check price on Amazon
Klein Tools Meter accessory kit with 3 ft extenders

The only set here that extends: three feet of lead plus three feet of adapter, in a case you can wear.

Stated rating
CAT III 1000 V / CAT IV 600 V, stated — the same pairing as the two other Klein sets, and these three are the only CAT IV items on this shelf. The rating is given for the kit rather than itemized per part, which is worth noting on a set whose whole point is that the parts screw together
Length and reach
3-FOOT right-angle lantern-style leads PLUS 3-FOOT extension adapters — six feet, 183 cm, assembled. That is the longest reach on this shelf by a clear margin: the longest single lead here is the PUKAIBUL at 125 cm (49.2 in) and the published PeakTech is 120 cm (47.2 in). A meter hung on a magnet at the side of a cabinet while the probes reach the far end of a board is what this buys
Plugs and tips
Right-angle, LANTERN-STYLE tips, with removable threaded lead HEADS that connect either directly to the right-angle leads or to the extenders. A lantern tip is a sprung sleeve round the probe that grips a terminal rather than resting against it. No shrouding is described for the plugs
Insulation
NOT NAMED, as on both other Klein sets. This shelf's introduction compares silicone against PVC for cold flexibility, and this listing describes the case in more detail than the cable
Supplied
Two right-angle leads, two extenders, two removable lead heads, two screw-on alligator clips, and a carrying case with elastic straps for the heads, pockets for the leads and a BELT LOOP. Nine pieces and a case. 322 grams — the heaviest Klein item on this shelf
Also stated
Klein positions it as "an upgrade or replacement lead kit compatible with clamp meters, multimeters, or other test equipment with standard lead connections". The threaded heads are the mechanism that makes the kit modular: a clip, a probe head and an extender all take the same thread
Amazon reference
B0F167XRH8
EAN
0092644694837
- Six feet of reach, the longest on this shelf
- CAT III 1000 V and CAT IV 600 V
- Fifty dollars, the most expensive of the three Klein sets here
Best for: A meter that has to stay put while the probes go somewhere else — a cabinet at head height, a board across a room

≈ $50
Check price on Amazon
Linkhood Back probe kit, 31 pieces, 30 V

A kit built entirely around reading a connector from behind, rated 30 volts — the lowest on this shelf by a factor of thirty.

Stated rating
TWO RATINGS ON ONE PAGE. The back probes are stated for "testing up to 30 Volts for Connectors, Automotive Sensors and Fuel Injectors", and the alligator clips separately as "CATII 300Vac/15A". The description then gives "Rated Voltage: 30V" for the kit. Thirty volts is the LOWEST figure on this shelf by a factor of thirty, and it is the right one to believe: a kit is rated by its weakest part, and these are 0.07 mm (0.003 in) needles
Insulation
SOFT PVC, stated — "Cable Material: Soft PVC". It is the ONLY product on this shelf whose insulation is named as PVC, and this shelf's introduction says in so many words that silicone "stays flexible in the cold where PVC goes stiff and cracks". Five sets on this shelf name silicone; the three Klein sets name nothing; this one names the material the hub warns about
Probes and angles
15 BACK PROBE PINS in stainless steel, at THREE angles — 90°, 135° and straight — in five colors, with 0.07 mm (0.003 in) needle tips. Three angles is the specification that makes the kit: a connector you can reach from directly behind takes a straight pin, one in a loom against a bulkhead takes 90°, and 135° is for everything in between. No other product on this shelf offers an angle at all
Plugs and tips
4 mm (0.16 in) banana plugs, stated. Five banana-plug-to-alligator-clip leads, five WIRE PIERCING PROBES that connect to the banana leads, and five nickel-plated copper alligator clips with a maximum jaw opening of 15 mm (0.59 in). The piercing probes work through a white plastic case: the wire goes in the case and the probe pierces it, which keeps the pierced spot located and the needle supported
Length
39.37 inches, 1 meter, for each of the FIVE leads. Five leads rather than two is unusual on this shelf and it is deliberate: diagnosing a sensor often means holding a reference, a signal and a ground at once, across two instruments
Supplied
31 pieces: 15 back probe pins, 5 banana-to-clip leads, 5 wire piercing probes, 5 alligator clips, and a storage box. 230 grams, $20.37. Stated for "Automotive Diagnostics, Testing, and Repairing, but also used in Physics Laboratories, Service Shops, Schools, Homes, and Industries"
Amazon reference
B0CKZD44HL
EAN
0677998303682
- Three probe angles, which nothing else here offers
- Fifteen back probes, so a connector stays plugged in
- Thirty volts, the lowest rating on this shelf
Best for: Automotive sensor and injector diagnosis, where the connector stays plugged in and the signal is a few volts

≈ $20
Check price on Amazon

Elsewhere in the spares drawer

Lufkin Chalk reel, 100 ft, cast aluminum body

The only metal-bodied reel on this shelf and the cheapest thing on it — and it doubles as a plumb bob.

Material
A cast aluminum body, stated for increased durability. It is the ONLY metal shell on this shelf — two reels here are ABS and the rest name no material at all — and on a tool that gets dropped off staging that is the difference between a dent and a crack
Stated dimension or range
100 ft of line. No line diameter appears, as on every reel here
Measuring mode
A centreline marker for use as a PLUMB BOB, stated. It is unique on this shelf: the reel hangs from its own line and the marker shows where the center of gravity falls, so one tool sets out a horizontal snap and a vertical drop
Body and fittings
A sliding door for quick and easy chalk refilling, stated, and a built-in storage dock that protects the end hook when not in use
Functions
NO GEAR RATIO IS PUBLISHED. This shelf's introduction calls a geared rewind the whole ergonomic argument of this family, and four of the nine reels here — including this one — give no ratio at all. On 100 ft of line, an ungeared rewind is well over a hundred turns
Supplied
No chalk is stated as included, and no sealing organ is described beyond the sliding door
Amazon reference
B08FMV6B9J
EAN
0037103339140
- Cast aluminum, one of only two metal bodies on this shelf
- Eight dollars fifty, the cheapest reel here
- No gear ratio published at all, on 100 ft of line
Best for: A reel that gets dropped, and anybody who would rather carry one tool than two

≈ $8
Check price on Amazon
Milwaukee Chalk reel, 100 ft, 6:1 gearing

The fastest rewind on this shelf at a stated 6:1, and the only reel that describes its gearbox rather than just its ratio.

Stated dimension or range
100 ft of high-strength braided line, stated to resist abrasion. No line diameter appears — this shelf's introduction notes that no maker on this shelf publishes one
Functions
A 6:1 gear retraction ratio, stated — the fastest on this shelf, against 4:1, 3:1 and 2:1 on the three other reels that publish a ratio. Six turns of line for one of the handle is the difference between a rewind and a wait
Body and fittings
A StripGuard clutch with a torque-dispensing planetary gear system, stated to give the longest gear life in chalk reels, plus flush handle storage and a rubber overmould. It is the only reel here that describes the mechanism behind its ratio rather than only the ratio
Supplied
Three ounces of red chalk and a fine-point Inkzall jobsite marker, stated. Three of the nine reels here ship chalk and two state that chalk is not included
Material
Rubber overmould over the body, stated. No shell material is named — one reel on this shelf is cast aluminum and two are ABS
Also stated
No case sealing mechanism is described. This shelf's introduction says case sealing decides whether the tool empties itself into a bag, and one reel on this shelf publishes a rubber stopper for it
Amazon reference
B01N8RJ9MI
EAN
0600210167120
- 6:1, the fastest rewind on this shelf
- The gearbox described: StripGuard clutch and planetary gears
- No case sealing mechanism described
Best for: A long day of 100 ft snaps, where the rewind is the part that costs time

≈ $25
Check price on Amazon
Klein Tools Chalk reel, 150 ft, 4:1 gearing

The longest line on this shelf and the only reel you can check without opening — a window for the chalk level and a stopper to keep it in.

Stated dimension or range
150 ft of braided line, stated for large-scale projects — the longest on this shelf, where five reels run 100 ft and one runs 30. No line diameter appears
Functions
A 4:1 gear ratio, stated to give four times faster retraction. Second fastest on this shelf behind a 6:1, and one of only four reels here that publish a ratio at all
Display
A chalk level window, stated to let you see the chalk level without removing the cap. It is unique on this shelf, and it answers the only question anybody asks of a chalk reel on site: is there chalk in it
Body and fittings
A rubber stopper stated to ensure secure chalk containment during transport and to enable clean refilling. It is the ONLY sealing organ published on this shelf — the five other reels describe a fill door instead, which is the opposite concern
Reference and mounting
A nested design keeping the ring flush against the reel body during transport, stated to prevent line tangling and accidental snags
Supplied
Chalk NOT included, stated. Two reels on this shelf ship chalk and two state it is not included; three say nothing
Amazon reference
B0GKJBPYBH
EAN
0092644861369
- 150 ft, half again the usual 100
- A chalk level window, which nothing else here has
- Thirty-five dollars, the most expensive reel here with a published gear ratio
Best for: Large-scale layout where a hundred feet runs out, and anyone tired of opening a reel to see if it is empty

≈ $35
Check price on Amazon

All test leads and probes

Klein Tools Heavy-duty clip leads, 18 AWG, 3 ft

Specifications

What the maker puts in writing

The only gauge on this shelf

Clips only, and they do not come off

Named for the job it is actually right for

Three feet is the short end of this shelf

Availability

What gets asked here

Instruments this fits

More test leads and probes

Klein Tools Right-angle lead set, CAT III 1000 V

Klein Tools Meter accessory kit with 3 ft extenders

Linkhood Back probe kit, 31 pieces, 30 V

Elsewhere in the spares drawer

Lufkin Chalk reel, 100 ft, cast aluminum body

Milwaukee Chalk reel, 100 ft, 6:1 gearing

Klein Tools Chalk reel, 150 ft, 4:1 gearing