Trimcal Body Measurement Kit – Trimcal 4000 Body Fat Caliper + Body Measuring Tape
Our best-selling body composition kit. Single-sided Trimcal 4000 caliper with dual-spring pressure + contoured 60-inch body measuring tape with wrap-and-lock design (inches + cm). Includes body fat % chart for men & women. 3 color combos. 131 reviews. By Sequoia Fitness. $18.47.
Our Take: This is our best-selling body measurement kit for a reason — it hits the sweet spot of price, quality, and completeness. At $18.47, you're getting the same Trimcal 4000 caliper that's sold standalone for $15.97, plus the contoured Trimcal Body Measuring Tape for just $2.50 more. That tape isn't a generic hardware-store tape — it's shaped to wrap around body curves and lock in place, which matters when you're trying to get repeatable readings on your waist or thighs by yourself. The caliper itself uses the dual-spring mechanism that's the Trimcal's main selling point: consistent jaw pressure whether you're measuring a 10 mm skinfold or a 60 mm one. No clicking, no guessing how hard to squeeze. The sliding scale gives you a direct reading that you convert using the included body fat chart. The one thing to know: this kit includes the single-sided caliper. The scale markings are on one side, which works fine for right-handed users but is slightly less convenient for lefties. If you want the dual-sided (ambidextrous) caliper, the Caliper & Tape Set is $19.97. With 131 reviews, this kit has a long track record. The feedback is mostly positive — users love the value and the tape. The main criticism is that the caliper's spring tension can feel firm on the first few uses, and the included body fat chart is printed in small font. Both are real, but neither is a dealbreaker.
Why you'd choose the Trimcal Body Measurement Kit
-
Best-Seller — 131 Reviews, $18.47
Our most-reviewed body composition product. At $18.47, it's just $2.50 more than the standalone caliper ($15.97) — and you get the contoured body tape included. Available in 3 color combos: Black/Black, White/Black, and Black/White. -
Dual-Spring Consistent Pressure
Two springs work together to maintain even jaw pressure throughout the measurement — one sets initial tension, the other keeps it uniform as you close. This eliminates the guesswork of how hard to squeeze, which is the biggest source of error with cheap single-spring calipers. You get repeatable readings every time. -
Contoured Body Tape — Wrap & Lock
The Trimcal Body Measuring Tape is shaped to follow body curves — not a flat hardware tape. It wraps around your waist, hips, arms, thighs, chest, and calves, then locks in place so you can read the measurement hands-free. 60 inches / 150 cm with clear dual-scale markings. Push-button retraction for fast, tangle-free use. -
Dual-Scale Tape — Inches + Centimeters
The tape shows both inches and centimeters on the same side, so you can use whichever unit you prefer without converting. Useful for military fitness testing (which often requires inches) and international training protocols (which use centimeters). Note: the tape doesn't start at zero — it begins at 1.75″ to compensate for the plastic hook mechanism. -
Measures Up to 80 mm Skinfold
The caliper jaw opens to 80 mm (3.15″) — wide enough for virtually any body type. Many budget calipers max out at 40–50 mm, which is too narrow for thicker sites like the abdomen and thigh on larger individuals. -
Body Fat % Chart Included
The included chart converts your skinfold measurements into an estimated body fat percentage, with separate tables for men and women. Uses standard multi-site protocols. While not a replacement for DEXA or hydrostatic testing, it provides a consistent baseline for tracking changes over time. -
No Batteries, No Apps, No Calibration
Entirely manual. Works the same today, tomorrow, and five years from now. No firmware, no Bluetooth pairing, no subscriptions. Unlike body fat scales, readings aren't affected by hydration, time of day, or foot moisture. Pick it up and measure. -
3 Color Combos Available
Available in Black Caliper / Black Tape, White Caliper / Black Tape, and Black Caliper / White Tape. All combinations are the same product with the same specifications — choose whichever matches your style or makes the scale markings easiest for you to read.
Who this kit is ideal for
- Anyone tracking fat loss or muscle gain — the caliper captures body fat changes while the tape captures circumference changes. Together, they tell a complete story that the scale alone can't.
- Personal trainers and coaches — fast, affordable baseline and progress tracking for clients at every session. The dual-tool setup covers body fat and measurements in under 5 minutes.
- Military and law enforcement — practice and prep tool for body composition tests and tape-test standards. Widely used by personnel and recruiters for informal pre-screening.
- Bodybuilders and physique competitors — tight monitoring of lean mass vs. fat during cuts, bulks, and contest prep.
- Home fitness and weight loss — straightforward, low-cost self-tracking that doesn't require equipment, subscriptions, or clinic visits.
- Pregnancy and postpartum — the contoured tape is well-suited for monitoring belly growth across trimesters and tracking recovery changes.
You may prefer a different option if…
- You're left-handed — this kit includes the single-sided caliper (scale on one side only). The Caliper & Tape Set ($19.97) has the dual-sided (ambidextrous) version.
- You only want the caliper — the standalone Trimcal 4000 is $15.97 in Black or White.
- You only want a body tape — the Trimcal Body Measuring Tape is available separately.
- You need clinical-grade precision — Harpenden or Lange calipers ($200+) with certified jaw pressure are the medical/research standard.
- You want Bluetooth tracking — smart body tapes like the RENPHO sync measurements to an app, though they cost more and require batteries.
Trimcal Body Measurement Kit Specifications
| Product Name | Trimcal Body Measurement Kit |
|---|---|
| Brand | Trimcal (Sequoia Fitness) |
| Includes | Trimcal 4000 caliper + Trimcal Body Measuring Tape + body fat % chart |
| Caliper Type | Single-sided skinfold caliper (scale on one side) |
| Caliper Mechanism | Dual-spring consistent pressure (no click mechanism) |
| Caliper Range | Up to 80 mm (3.15″) skinfold thickness |
| Caliper Grip | Ergonomic pistol grip — one-handed operation |
| Tape Design | Contoured body tape with wrap-and-lock, push-button retraction |
| Tape Length | 60 inches / 150 cm |
| Tape Scale | Dual — inches + centimeters |
| Tape Material | Flexible, durable vinyl |
| Tape Start Offset | 1.75″ (compensates for hook mechanism) |
| Included Guide | Body fat % chart — separate tables for men & women |
| Power Source | None — fully manual, no batteries |
| Bluetooth / App | No |
| Colors Available | Black/Black, White/Black, Black/White |
| Reviews | 131 reviews |
| Manufacturer | Sequoia Fitness |
| Price | $18.47 |
Which Trimcal Kit Is Right for You?
Three options — same caliper mechanism, different configurations.
| Feature | Caliper Only | Body Measurement Kit | Caliper & Tape Set |
|---|---|---|---|
| Price | $15.97 | $18.47 | $19.97 |
| Caliper Sides | Single-sided | Single-sided | Dual-sided (ambidextrous) |
| Dual-Spring Mechanism | ✔ | ✔ | ✔ |
| 80mm Range | ✔ | ✔ | ✔ |
| Body Fat Chart | ✔ | ✔ | ✔ |
| Tape Included | ✘ | ✔ — Contoured body tape | ✔ — Self-retracting tape |
| Tape Type | — | Wrap-and-lock, contoured | Push-button lock, retractable |
| Tape Scale | — | Inches + cm (dual) | Inches + cm |
| Best For | Caliper-only users who already own a tape | Best value — complete kit at lowest price with tape | Left-handed users or those who want ambidextrous caliper |
Trimcal Body Measurement Kit — Frequently Asked Questions
What's included in the Trimcal Body Measurement Kit?
The kit includes three things: the Trimcal 4000 single-sided body fat caliper with dual-spring pressure, the Trimcal contoured body measuring tape (60 inches / 150 cm, dual-scale, wrap-and-lock with push-button retraction), and a body fat percentage chart with separate tables for men and women. Available in 3 color combos.
What's the difference between this kit ($18.47) and the Caliper & Tape Set ($19.97)?
Two differences. First, this kit includes the single-sided caliper (scale on one side, optimized for right-handed use), while the Caliper & Tape Set includes the dual-sided caliper (readable from both sides, ambidextrous). Second, this kit uses the contoured Trimcal Body Measuring Tape with wrap-and-lock, while the other set uses a self-retracting tape with push-button lock. Both calipers use the same dual-spring mechanism, same 80 mm range, same body fat chart. If you're right-handed, this kit is the better value at $1.50 less.
Is this the same caliper as the standalone Trimcal 4000?
Yes — identical caliper. Same dual-spring mechanism, same 80 mm jaw range, same sliding scale, same body fat chart. The standalone Trimcal 4000 is $15.97 without a tape. This kit adds the contoured body measuring tape for $2.50 more.
Can left-handed people use this caliper?
You can, but it's less convenient. The single-sided caliper has scale markings on one side only, which is oriented for right-handed grip and reading. Left-handed users will either need to read at an angle or switch the caliper between hands. If ambidextrous use matters to you, the Caliper & Tape Set ($19.97) has the dual-sided version with markings on both sides.
How accurate is skinfold testing compared to DEXA or body fat scales?
With consistent technique, skinfold calipers are generally within 3–5% of DEXA scans. For tracking changes over time — which is what most fitness users care about — calipers are often more reliable than bioelectrical impedance scales, which can swing 3–5% in a single day based on hydration, meals, exercise, and time of day. The key is consistency: same sites, same technique, same person measuring, same time of day. The Trimcal's dual-spring mechanism helps by eliminating variable pressure as a source of error.
Can I measure myself without a partner?
Yes for most sites. The caliper's pistol grip is designed for one-handed use — your other hand pinches the skinfold. Common self-measurable sites include triceps, abdomen, suprailiac (hip), and thigh. The subscapular (upper back) site is easier with a partner. The tape's wrap-and-lock design is specifically built for solo circumference measurements.
Why doesn't the tape start at zero?
The tape starts at 1.75 inches to account for the plastic hook mechanism. This offset ensures that when the hook catches on the tape during a wrap-around measurement, the reading you see is the actual circumference — not inflated by the hook's length. This is by design, not a defect.
What do the reviews say?
With 131 reviews, the feedback is mixed-to-positive. Users consistently praise the value, the tape quality, and the convenience of the kit. The most common criticisms: the caliper's spring tension can feel firm (especially on the first few uses), the body fat chart is printed in small font, and some users find it hard to use the caliper on themselves. These are fair points — the spring does loosen slightly with use, and self-measurement takes practice. A partner makes caliper use easier, but most common sites can be done solo with some practice.
How often should I measure?
Every 2–4 weeks is ideal for most fitness goals. Body composition changes slowly, and measuring more often creates noise that hides real trends. Always measure at the same time of day (morning, before eating), at the same sites, with the same technique. Log your numbers and focus on the trend over months — not any single measurement.
Is this good for military body fat testing prep?
Yes — this is one of our most popular kits among military personnel and recruiters. The tape is ideal for practicing the DoD circumference-based tape test (neck, waist, and hips), and the caliper lets you cross-check with skinfold measurements. However, official military assessments use specific protocols and authorized equipment — check with your unit for exact requirements. This kit is widely used for informal pre-screening and personal tracking between official tests.
Need help choosing between the Trimcal Body Measurement Kit, Caliper & Tape Set, or Caliper Only? Call us at 1-800-403-8285 or 215-259-2700, or email sales@hrmusainc.com.
This body measurement kit includes calipers and tape for tracking fitness progress. Customers said "great quality" and "easy to use" with consistent measurements. However, accuracy concerns were noted - some found readings 5-6% lower than reality. The plastic calipers have sharp edges that may need sanding. Tape measure durability issues reported.
Me encanta que con esta herramienta del plicometro y la cinta métrica yo misma puedo tomarme mis medidas y estar al tanto de cómo va mi proceso en mi cuerpo
The tape measure starts at 2 inches. Please see the photo. What the heck? And the caliper does not have anything to hold the measurement. As you are "triggering" you must hope you're in the right position to read the measurement upside down. Weird.
false
First of all I’d like to say I know how to accurately track my bodyfat, I had a cheaper white pair of calipers and opted for an “upgrade”I believe the people saying these work well are probably delusional and just want to believe that their bodyfat is lower than it is.These calipers say I’m 7% bodyfat, tell me, do I look like I’m currently 7% bodyfat? I’d say I look more like 13-15%. In this photo I’m not flexing at all, in bad lighting but you can see in pinching my love handle fat, where I store a large portion of fat genetically.Anyways probably 1-2 people will see this, if this review helped give it a thumbs up or whatever, I just want to know how many people I saved from wasting their time and money, because I never leave reviews.this is going to be returned.
The product seems generally satisfactory, but the measuring tape starts at 2 inches, requiring that an inch be deducted from each measurement.
It was larger and sturdier than I expected. It measures about 9x8". The plastic seems thick and quality. The springs close the measuring claws so it will give repeatedly accurate results. The springs are good quality, but could be replaced if broken. The old ones would need to be cut off, but the anchors could easily hold new springs (see picture). Comes with a 3-point measuring system and a 2page result chart. Could easily be used with a 6-point system found online for free, but my point is you can use it straight out of the package without anything else but yourself.Definitely recommend for someone who wants a cheap but quality skinfold caliper.
The tape measure is great. The calipers ... not so much. They're plastic and they have some flex. And I find it hard to use on myself. So I just use the tape measure and a formula I found online to estimate my body fat.
This did not work for me at all. It is not built well, and I did extensive research and the numbers do not seem accurate.
This is a great tool! Easier to use with a friend than on your own- but not impossible. Great measuring info with it. If you’re looking for a body fat measure- this is a strong tool and will get the job done.
Happy with purchase.
Poor accuracy. Done this for years
We use them to measure the heels of patients. Works great. Good price. Good purchase.
Good product
These calipers are precise and will produce repeatable values. The accuracy is off. It will consistently give a body fat percentage that is 5-6% lower than reality.If you are just looking for improvement, these calipers will track a delta. If you want true values, look further
Not best quality, came with a sharp pc of plastic right where it pinches fat. Had to sand it off
Seems fine, but I’m new to this so perhaps I need practice with it. I used the calipers and followed the instruction sheet to use the tool on myself. I’m male, 5 ft 9 in 195 lbs and have been lifting weights several days per week for some time now. This tool calculated me at 51% body fat. At 5’9” and 195?! Seems high. I used the tape to take measurements and plugged them into a body fat calculator and got 23.1%. My BMI at the doctor’s a few days ago was 29. So I think the 23.1% is more accurate. The caliper is large and it’s a bit cumbersome to use on yourself. Maybe I just need to practice with it.The measuring tape seems decent. I’ve used a tailor’s tape to measure before which is quite cumbersome to use on myself because it doesn’t hold itself like this tape does. This tape also starts at 2 inches to account for the body of the device itself. So I trust it’s pretty accurate. The measurements that I got with this tape are in line with what I got with the tailor’s tape. I think this tape is a good tool. Actually, I think they may both be good tools once you know how to use them and practice getting accurate readings with the calipers. Am I overweight? Yes, but not obese. 51 percent is morbidly obese! I’m nowhere close to that. Not by a very long shot! BMI comes from height vs weight, but I’m a bodybuilder so I’m going to be a bit heavy for my height and I do have body fat but my belly is pretty flat and there’s just no way I’m 51% fat! Are you kidding?! So practice with the calipers until you can get the pinch correct and see the readings clearly. It could be that my calipers are wrong too. I don’t know yet. I may have to update this review. Of course, this is not a medical grade device and won’t be as accurate as one. If you REALLY need to know your accurate body fat, ask your doctor or see if your gym has one. Maybe your personal trainer can give you an accurate reading with it. Summary: tape good, calipers meh, I don’t know.
Does the job
Was everything I expected.
Proves that I’m skinnier than my obese neighbor. Always felt superior but now I know officially. Twelve percent here so eat it Fred !
The stop in the retractable tape measure broke off after a week just from being in my gym bag
Ok! Functional
The measuring tape is fine, thus the 2 starts. But zero stars for the body fat calipers. They're unwieldy, painful, and difficult to use. Ended up not using them and just figuring out body fat via the navy method using body measurements with the tape. Wish I had just purchased the measuring tape.
The chart you get with the kit is in super small font and it’s in black/white. Plus, I found the caliper to be painful with how hard/tight it holds your skin. I do plan on returning, I would not recommend.
Cumple con su propósito
It was relatively low cost but fell apart quickly so will spend more on something a bit more durable and accurate.
So my boyfriend is a trainer and needed a new one and his was taking measurements but there was a plastic piece where it pinches that was so super sharp and hurt!! We filed it down and now it’s perfect! So I would just make sure the surface is smooth
The material was cheaply made. The edge of the clipper was not smooth, and some plastic edges were not rounded. As a result, it hurts on my skin. For those with sensitive skin could have more irritation. The reading and accuracy was quite decent comparing the measuring with other professional grade products. The producer must make sure a good Quality Control is in place.
These calipers are good for the price