Smallest internal size it can measure? Thanks :)

Mine have a measuring range of up to 6 inches, not 4 as advertised, and the narrowest opening you can get the internal measuring calipers into is about 7.5 millimeters (then re-zero)

is this accurate to within 0.5mm

There is no simple answer to this. The reading is to two decimal places in mm so you might imagine that it would read to 0.01 mm. But there is a potential error in the mechanism that gauges the movement of the arm to create the readout. You would need different standard blocks to measure against. Using my old feeler gauges, the 25 thou size which in mm is 0.635 mm my Vernier gauge reads between 0.62 and 0.65 which varies as I put pressure on. So at this dimension the vernier accuracy is certainly at least ten times better than 0.5 mm - somewhere around +/-0.015 mm. My micrometer tells me that the feeler gauge is correct.

I bought one of these and it displays exactly half of the correct measurement (e.g. 50mm shows as 25mm). Am I doing something wrong ?

When you turn on make sure that the measurement part is closed and press the button to zero. This makes the measurement go from zero and as it opens to measure something the reading should then be more accurate.

what is slot on top with triangle mark if opened it has four connector pins like usb

Interesting. I hadn't noticed this before. There is no mention of the slot's purpose in the handbook. I can only think that the access to the circuitry (via the pins) is to set the vernier gauge up, probably calibrating it prior to shipment.

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150mm 6inch Plastic Digital Caliper LCD Digital Electronic Ruler Carbon Fiber Vernier Caliper Gauge Micrometer Measuring Tool

150mm 6inch Plastic Digital Caliper LCD Digital Electronic Ruler Carbon Fiber Vernier Caliper Gauge Micrometer Measuring Tool

Product ID: 58131994

Details

Brand
CACHOR
Material
Plastic Carbon
Measurement accuracy
± 0.2 mm
Product dimensions
24.4L x 8.1W
Range
150

📏150mm / 6-inch range

🔋Auto power save & spare battery

🔢0.01in / 0.1mm resolution

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Description

📐 Measure Like a Pro, Never Miss a Detail!

CRYSTAL CLEAR LCD - Extra-large digital display ensures effortless reading, reducing errors and boosting efficiency.
DUAL MODE PRECISION - Seamlessly switch between inches and millimeters with one button for versatile, exact measurements.
LIGHTWEIGHT PORTABLE - At just 53g, carry precision wherever you go—perfect for on-the-spot professional use.
SMART POWER MANAGEMENT - Auto power-on/off plus included spare battery means you’re always ready to measure without downtime.
MULTI FUNCTION MEASUREMENT - Measure inside, outside, depth, and steps with specialized jaws and probe for all your project needs.

This 150mm (6-inch) digital caliper combines carbon fiber reinforced plastic durability with ultra-precise measurements down to 0.01 inch/0.1 mm. Featuring a large LCD screen, dual measurement modes, and smart power-saving technology, it’s the essential tool for professionals and hobbyists demanding accuracy and convenience in one sleek, lightweight package.

Specifications

ASIN	B077NF3R3X
Best Sellers Rank	16,530 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 30 in Vernier Callipers
Brand	CACHOR
Country Of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (2,816)
Item Dimensions L x W	24.4L x 8.1W centimetres
Manufacturer	CACHOR
Manufacturer Part Number	SL-01 SL-53 SL-10
Material	PLA_(Polylactic_Acid), PE_(Polyethylene), Plastic Carbon Fibre
Measurement Accuracy	± 0.2 mm
Number of Batteries	2 LR44 batteries required. (included)
Number of Items	1
Range	150 millimeters

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HK$134

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

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TrustScore 4.5 | 7,300+ reviews

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