Test leads and probes

Bionso 25-piece probe kit with threaded tips

Five tip sizes, two hooks, two back probes and a wrench to swap them — and not a single rating figure on the page.

Bionso 25-piece multimeter test lead kit with interchangeable gold-plated probes

Bionso 25-piece probe kit with threaded tips

Five tip sizes, two hooks, two back probes and a wrench to swap them — and not a single rating figure on the page.

Stated rating: NO CATEGORY AND NO VOLTAGE PUBLISHED. Twenty-five pieces, $29.99, five bullets of specification, and not one figure for category, voltage or current. It is one of five sets on this shelf that publish no category at all, with the Fluke TL175, the AUTOOL kit, the KAIWEETS set and the PeakTech pair. This shelf's introduction makes stated ratings the first of its five comparisons, and the published PeakTech fiche on this shelf says a rating should be in the listing
Insulation: SILICONE, "cold and high temperature resistant, very soft, more flexible use", double insulated, with "100 high-purity copper wire" — a phrase that is presumably meant to read 100 per cent. No temperature figures and no gauge. Silicone is the material this shelf's introduction prefers over PVC
Plugs and tips: REPLACEABLE gold-plated probes in five sizes: four at 1.0 mm (0.04 in), two at 2.0 mm (0.08 in), two 3.8 mm (0.15 in) banana plug probes and two 0.7 mm (0.03 in) back probe pins, plus two test HOOKS that clip onto a component leg and stay there. Two TIP SHROUDS are included — cover for the exposed metal, which only the Fluke otherwise addresses on this shelf, and here as a separate part rather than an adjustable sleeve
Length: 43 inches, 109 cm, for the two leads. Mid-length on this shelf: under the PUKAIBUL's 125 cm (49.2 in) and the published PeakTech's 120 cm (47.2 in), over the Klein 69410's 104 cm (40.9 in)
Supplied: Two 43-inch leads, two handles, four 1.0 mm (0.04 in) probes, two 2.0 mm (0.08 in) probes, two 3.8 mm (0.15 in) banana plug probes, two 0.7 mm (0.03 in) back probe pins, two alligator clips, two tip shrouds, ONE WRENCH, two test hooks and two storage boxes. Twenty-five pieces. The wrench is the only tool supplied with anything on this shelf, and it exists because threaded tips have to be nipped up rather than finger-tight. 210 grams
Also stated: A three-month refund and a two-year warranty, both stated. Bionso claims the kit "works perfectly with any multimeter, clamp meter or test instrument", which is a compatibility claim and not a rating. Compared with the published AUTOOL set on this shelf, which runs to 68 pieces, this is the smaller of the two big kits
Amazon reference: B07GNVFL5D
EAN: 0676422471515

Five tip sizes from 0.7 to 3.8 millimeters
A wrench, so the threaded tips can actually be tightened
No category, no voltage, no current — anywhere

Best for: Electronics and bench work where the test point changes every ten minutes and the voltages are low

≈ $30

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Specifications

Stated rating: NO CATEGORY AND NO VOLTAGE PUBLISHED. Twenty-five pieces, $29.99, five bullets of specification, and not one figure for category, voltage or current. It is one of five sets on this shelf that publish no category at all, with the Fluke TL175, the AUTOOL kit, the KAIWEETS set and the PeakTech pair. This shelf's introduction makes stated ratings the first of its five comparisons, and the published PeakTech fiche on this shelf says a rating should be in the listing
Insulation: SILICONE, "cold and high temperature resistant, very soft, more flexible use", double insulated, with "100 high-purity copper wire" — a phrase that is presumably meant to read 100 per cent. No temperature figures and no gauge. Silicone is the material this shelf's introduction prefers over PVC
Plugs and tips: REPLACEABLE gold-plated probes in five sizes: four at 1.0 mm (0.04 in), two at 2.0 mm (0.08 in), two 3.8 mm (0.15 in) banana plug probes and two 0.7 mm (0.03 in) back probe pins, plus two test HOOKS that clip onto a component leg and stay there. Two TIP SHROUDS are included — cover for the exposed metal, which only the Fluke otherwise addresses on this shelf, and here as a separate part rather than an adjustable sleeve
Length: 43 inches, 109 cm, for the two leads. Mid-length on this shelf: under the PUKAIBUL's 125 cm (49.2 in) and the published PeakTech's 120 cm (47.2 in), over the Klein 69410's 104 cm (40.9 in)
Supplied: Two 43-inch leads, two handles, four 1.0 mm (0.04 in) probes, two 2.0 mm (0.08 in) probes, two 3.8 mm (0.15 in) banana plug probes, two 0.7 mm (0.03 in) back probe pins, two alligator clips, two tip shrouds, ONE WRENCH, two test hooks and two storage boxes. Twenty-five pieces. The wrench is the only tool supplied with anything on this shelf, and it exists because threaded tips have to be nipped up rather than finger-tight. 210 grams
Also stated: A three-month refund and a two-year warranty, both stated. Bionso claims the kit "works perfectly with any multimeter, clamp meter or test instrument", which is a compatibility claim and not a rating. Compared with the published AUTOOL set on this shelf, which runs to 68 pieces, this is the smaller of the two big kits
Amazon reference: B07GNVFL5D
EAN: 0676422471515

What the maker puts in writing

“2x 43” test leads, 2x handles, 4x 1.0mm (0.16 × 0.04 in) gold-plated probes, 2x 2.0mm (0.08 × 0.08 in) gold-plated probes, 2x 3.8mm (0.08 × 0.15 in) gold-plated banana plug probes, 2x 0.7mm (0.08 × 0.03 in) back probe pins, 2x alligator clips, 2x tip shrouds, 1x wrench, 2x test hooks, 2x beautiful storage boxes”
“the leads are made of high quality silicone, cold and high temperature resistant, very soft”
“A double insulated lead with 100 high-purity copper wire”
“A replaceable gold-plated probe ensures high strength, high conductivity”
“works perfectly with any multimeter, clamp meter or test instrument”
3-month refund · 2-year warranty · 210 g (7.4 oz) · $29.99

NO category. NO voltage. NO current. No temperature figures. No gauge.

Five tip sizes and a wrench

Which is the kit, and the wrench is the part that shows somebody had used one.

Nought point seven for a back probe. One millimeter for a dense board. Two for general work. Three point eight for a banana socket. And two hooks that clip onto a component leg and stay there.

One handle takes all of them, which means a screw joint carrying the measurement.

A screw joint done finger-tight works loose, adds contact resistance and reads intermittently.

A small wrench turns that from a recurring annoyance into something you do once. It is the only tool supplied with anything on this shelf.

Two tip shrouds, as parts

Cover for the exposed metal.

Only the Fluke otherwise addresses tip exposure on this shelf, and it does it with an adjustable sleeve you twist.

Here they are two separate pieces you fit, which is a cheaper answer to the same problem and one more thing to lose.

And then nothing at all about ratings

Thirty dollars. Twenty-five pieces. Five bullets of specification.

Not CAT II. Not CAT III. No voltage. No current.

“The leads carry the same CAT rating as the meter, or they do not.”

Five sets on this shelf name nothing: this, the Fluke TL175 at $33.83, the AUTOOL kit, the KAIWEETS set and the PeakTech pair. Three Klein sets print CAT III 1000 V and CAT IV 600 V in a bullet, at twenty dollars.

The rated pairing of a meter and its leads is the lower of the two.

Twenty-five against sixty-eight

The published AUTOOL kit on this shelf runs to 68 pieces.

So this is the smaller of the two large kits here — and the one with the wrench.

Piece count is the easiest number to compete on and the least useful. Four 1.0 mm (0.04 in) probes is four of the same thing.

What silicone and copper claims are worth without numbers

“Cold and high temperature resistant.” No figures.

The Eiranoly here publishes minus fifty to plus two hundred Celsius, which is the only such range on this shelf.

“100 high-purity copper wire” is presumably meant to read a hundred per cent, and either way it is a sentence rather than a gauge. The Klein 69381 publishes 18 AWG.

Availability

On sale at around 30 € 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

Can I use an unrated kit on mains?

That is a decision to make against the instructions supplied with your instrument, not against a review. What this shelf can tell you is the arithmetic from this shelf's introduction: the rated pairing of a meter and its leads is the lower of the two, so leads with no published category give you an instrument with no published category, whatever the meter is stamped with. This kit publishes nothing — not CAT II, not a voltage, not a current. For bench electronics at low voltage that is a smaller question than it looks. For a consumer unit, three Klein sets on this shelf print CAT III 1000 V in a bullet for twenty dollars.

What is the wrench actually for?

Nipping up the threaded tips. The point of this kit is that one handle takes five different probes, which means a screw joint carrying the measurement — and a screw joint done finger-tight works loose, adds contact resistance and eventually reads intermittently. A small wrench turns that from a recurring annoyance into a thing you do once. It is the only tool supplied with any product on this shelf, and it is a sign the kit was designed by somebody who had used one.

Twenty-five pieces or two leads — which do I need?

It depends how often the test point changes. On a consumer unit the terminals are all the same and one good rated pair is the whole requirement. On a board, a loom or a bench you want a 0.7 mm (0.03 in) back probe for a connector, a hook that clips onto a component leg and frees your hand, a 1.0 mm (0.04 in) point for a dense board and a 3.8 mm (0.15 in) banana probe for a socket — and swapping them beats owning four pairs of leads. This kit is for the second case, and for the first it is the wrong purchase at any number of pieces.

Instruments this fits

More test leads and probes

Eiranoly Silicone lead pair, CAT II 1000 V, 103 cm (40.6 in)

The cheapest set on this shelf, the only one that publishes a temperature range — and the only CAT II leads with a 1000 V figure beside it.

Stated rating
CAT II 1000 V, 20 A, stated. That is the point to read carefully, because the buying tip on the multimeter shelf of this site puts it exactly: the category and the voltage are one specification, not two, and the higher-looking number is not the safer tool. CAT II 1000 V is a LOWER category than the CAT III 1000 V of the PUKAIBUL at $9.99 and the CAT III 1000 V / CAT IV 600 V of the three Klein sets — and fitting these to a CAT III meter gives you, per this shelf's introduction, a CAT II pairing
Insulation
DOUBLE-INSULATED SILICONE, with the only OPERATING TEMPERATURE RANGE published anywhere on this shelf: −58 °F to +392 °F, −50 °C to +200 °C (392 °F). This shelf's introduction compares silicone against PVC for cold flexibility and no other listing here puts a number on it — the Fluke says "remain flexible in cold temperatures" without one
Length
40.5 inches, 103 cm, stated. Mid-length for this shelf: shorter than the PUKAIBUL's 125 cm (49.2 in) and the published PeakTech's 120 cm (47.2 in), a centimeter under the Klein 69410's 104 cm (40.9 in), longer than the 91 cm (35.8 in) of the two other Klein sets
Plugs and tips
Gold-plated ULTRA-SHARP probes, stated to pierce wire insulation or reach a solder joint on a dense board, and "a universal 4.2mm (0.17 in)(0.16inch) banana plug". Two figures that do not agree: 0.16 inch is 4.06 mm (0.16 in), and the standard every other listing on this shelf names is 4 mm (0.16 in). A plug genuinely 4.2 mm (0.17 in) across would be a tight fit in a 4 mm (0.16 in) socket; the likeliest reading is that this is a standard 4 mm (0.16 in) plug described loosely
Supplied
One red lead, one black lead, one red clip, one black clip and FOUR probe safety covers — two more than needed, and the listing explains why: "customers have reported that they are easily lost, so we've included 2 extra probe covers". That is the only listing on this shelf that changed its contents because of what buyers said. 77 grams, the lightest set on this shelf
Also stated
Compatible with "almost all mainstream brands of multimeters and clamp meters such as Fluke, AstroAI, INNOVA, Klein Tools". Stated to be tangle-resistant and stretch-resistant. At $6.79 it is the cheapest item on this shelf
Amazon reference
B0FC9K5VTY
EAN
0607601283025
- Minus fifty to two hundred Celsius, the only range published here
- Silicone, double insulated, named
- CAT II, where the rest of the rated sets are CAT III or IV
Best for: A second pair for the drawer, on circuits where CAT II is the right category and the cold matters

≈ $7
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AUTOOL Test lead kit, 68 pieces

A 68-piece kit in silicone rather than PVC — the insulation that stays flexible hot and cold, and the reason a good lead feels different in the hand.

Amazon reference
B0CXDTL7QH (identical on 6 markets)
EAN
6972697788988
Supplied
68 pieces
Insulation test
silicone insulation
Construction and safety
universal instrument fit
- Sixty-eight pieces, covering essentially every connector a bench needs
- Silicone insulation, stated as flexible and durable — the better material for test leads
- No measurement category or voltage published
Best for: A bench where the measurement is different every time and the connector is never the one you have.

≈ $62
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Fluke TwistGuard leads with wear indication

The only leads here that show you their own wear — and, at $33.83, one of two sets that never name a category.

Stated rating
NO CATEGORY NAMED. The listing says the TwistGuard shroud "meets the highest electrical safety requirements" and never writes CAT II, III or IV, nor a voltage. This shelf's tag line is "the leads carry the same CAT rating as the meter, or they do not", and at $33.83 it is among the most expensive sets here — the Bionso at $29.99 also names no category. Three Klein sets here publish CAT III 1000 V and CAT IV 600 V in a bullet
Insulation
DOUBLE INSULATED SILICONE, and the second layer does a job: "WearGuard lead wire wear indication. Each test lead is covered by two layers of silicone insulation; inner contrasting color is exposed when the leads are nicked, scuffed, or otherwise damaged and in need of replacement." Stated to withstand high temperatures and remain flexible in cold, with no figures. Extra-heavy-duty strain relief at both the probe end and the plug end
Plugs and tips
2 mm (0.08 in) probe tips with a PATENTED TWISTGUARD EXTENDABLE TIP SHROUD: twist the shroud and the amount of exposed metal changes, so the same probe suits a shrouded terminal and an open test point. Removable 4 mm (0.16 in) LANTERN TIPS thread on. The input plugs are "standard 4 mm (0.16 in) SHROUDED banana plugs" — the only listing on this shelf that calls its plugs shrouded, which this shelf's introduction names among its five comparisons
Durability
TESTED BEYOND 30,000 BENDS WITHOUT FAILURE, stated. It is the only durability figure published on this shelf, and it is the right figure for the part this shelf's introduction calls "the part of a meter that gets stood on". The strain relief is called out separately at both ends, which is where a lead actually dies
Length
NOT PUBLISHED. Every other set here that states a length gives one — 91 cm (35.8 in), 103 cm (40.6 in), 104 cm (40.9 in), 109 cm (42.9 in), 125 cm (49.2 in), 1 m (3 ft) — and this one does not, on a page that otherwise publishes more than any of them
Also stated
120 grams. Fluke writes that the TL175 "are the only test leads as tough as your meter", which is a claim about the pairing rather than a specification. The whole listing is built on two named technologies, a bend count and a shroud, and omits the category and the length
Amazon reference
B005CTI592
EAN
0021111461641
- Two silicone layers, the inner one a wear warning
- An adjustable tip shroud — no other lead here has one
- No measurement category anywhere on the page
Best for: Anyone who follows this shelf's buying tip literally, because these leads do the inspection for you

≈ $34
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Elsewhere in the spares drawer

IRWIN Chalk reel, 100 ft, aluminum, 1:1

The only reel here that says how many lines you get from one pull — five or six — and the only one whose spool aerates the chalk.

Functions
FIVE TO SIX STRIKES PER PULL, from 100 ft of abrasion-resistant poly line — stated, and it is the only strike count published on this shelf. That figure matters more than a gear ratio for a lot of work: pulling the line once and snapping five parallel lines off it is five snaps with one rewind
Body and fittings
A 1:1 gear ratio, stated as simple line retraction. One to one is the SLOWEST on this shelf — the others publish 6:1, 4:1, 3:1 and 2:1 — and it is paired here with a robust steel handle and a large center hub stated for durability, strength and torque. Direct drive with a steel crank is the choice that survives a bound line
Material
An Aluminum housing stated for impact resistance. It is one of only two metal shells on this shelf; the rest are ABS or unstated, and a metal case dents where plastic cracks and empties itself
Also stated
An innovative spool design stated to help preserve the line AND AERATE THE CHALK. Aeration is published by nobody else here and it is a real mechanism: chalk packs down round a wound line and stops loading it, and a spool that lets air through keeps the powder loose
Measuring mode
The center line can be used as a plumb bob, stated. It is one of two reels on this shelf that doubles that way — the reel hangs from its own line and marks a vertical from a ceiling point
Supplied
Blue chalk included, stated, in a kit with the reel. Blue is the removable color: it brushes out of plaster and timber where red does not, which makes this a finishing reel as supplied
Reference and mounting
A nested hook dock stated to reduce hook snags, and a wide fill door stated to improve visibility when refilling. A slim profile is stated to enhance grip for low-strain use
Amazon reference
B0BWL62GNJ
EAN
0885911883146
- Five to six strikes per pull, the only strike count here
- An aluminum housing, one of two metal shells on this shelf
- 1:1, the slowest gearing on this shelf
Best for: Repeated snaps along one run, where the reel is pulled out once and used five times

≈ $10
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Gakago Chalk line set, 30 m (98 ft), with permanent chalk

A chalk line sold with permanent chalk rather than temporary — a choice that decides where the tool can be used, and where it must not be.

Amazon reference
B0G3S13RRX (identical on 6 markets)
EAN
4260767450388
Stated dimension or range
30 m (98 ft) line
Stated weight
150 g (5.3 oz) permanent red chalk
Material
aluminum body
- Supplied with 150 g (5.3 oz) of permanent chalk, stated as giving durable water-resistant lines
- Thirty meters of marking line in an aluminum body
- Permanent chalk on the wrong surface cannot be removed
Best for: Roof, slab and external work where the line has to survive the weather.

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Kendo Chalk line set, 30 m (98 ft), three pieces

A 30 m (98 ft) chalk line with a level vial built into the case — so the line can be checked for level as it is set, without a second tool.

Amazon reference
B07FWD28H1 (identical on 5 markets)
EAN
6903366453425
Stated dimension or range
30 m (98 ft) line
Body and fittings
stainless hook
Reference and mounting
integrated level vial
Supplied
chalk included
- A level vial built into the case, so a horizontal line is set and checked with one tool
- A stainless hook, which is the part that rusts and then stains every line you snap
- No gear ratio published — rewinding 30 m (98 ft) by hand is slow
Best for: Setting a level line where carrying a separate spirit level is one tool too many.

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All test leads and probes

Bionso 25-piece probe kit with threaded tips

Specifications

What the maker puts in writing

Five tip sizes and a wrench

Two tip shrouds, as parts

And then nothing at all about ratings

Twenty-five against sixty-eight

What silicone and copper claims are worth without numbers

Availability

What gets asked here

Instruments this fits

More test leads and probes

Eiranoly Silicone lead pair, CAT II 1000 V, 103 cm (40.6 in)

AUTOOL Test lead kit, 68 pieces

Fluke TwistGuard leads with wear indication

Elsewhere in the spares drawer

IRWIN Chalk reel, 100 ft, aluminum, 1:1

Gakago Chalk line set, 30 m (98 ft), with permanent chalk

Kendo Chalk line set, 30 m (98 ft), three pieces