Top positive review
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Excellent value for the money and satisfactory accuracy; consistency may be less good
on 26 June 2015
This appears to be either identical or closely similar to electronic calipers available from a number of sellers and at various prices. The instrument is partly mechanical and the electronics are used to provide the readings as an alternative to interpreting one or several engraved scale markings.
It is constructed primarily from steel and will provide dimensions of items up to about 150mm in diameter or width, but it is not designed or priced for absolute precision. It is quite heavy and appears solid where it most matters. It uses the inexpensive LR44 (approx 1cm diameter) button cells or the silver oxide SR44 alternatives which will be longer lasting and more reliable. You may need a pack from the outset as it is not uncommon to find those provided with items such as this dead upon arrival, especially when they are unknown or unreliable brands. It is sold in a solid storage case which will help protect it when not in use and in which spare battery packs could be kept for convenience - one was installed and a spare is included, but it was ON when opened for the first time!
On the display unit, it has a button to alternate between Imperial and metric measurements (inches/millimeters) and a zeroing button that is best used each time you use it. It is capable of both internal and external measurements (in tubing, for example), or where otherwise relevant. Depth measurements, again within the 150mm capability of the tool, are its final function.
As with other inexpensive electronic devices and test equipment such as thermometers, voltage meters etc, it is best to take several successive readings - three or five is often suggested - in order to compensate for those variables that may affect accuracy although a consistent method of use may help improve things, for example rotating the control knob at a constant speed. An average of several readings will generally give better accuracy than one in isolation. For many purposes, a measurement to the nearest 0.5 or 1mm will be more than sufficient when the engraved scale alone may suffice.
Stated accuracy is +/- 0.02mm which is more than adequate for most needs and especially if consistent across its range limits. For measuring pipes, mouldings and other objects where a ruler or tape measure would be impractical or too inaccurate, this will provide a good-to-high degree of accuracy. If you need a higher degree of accuracy, a precision grade alternative may be justified but you may pay in excess of £100 for a tool without a digital display.
For use at home or within a hobby, for students (school or uni) of engineering and related subjects, this could be a good starting instrument. It could even be a sensible companion to a laser measure, that for the larger scale and this for the much smaller.