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I bought it because, unlike other similar testers, it claims to measure 3V batteries, such as the common CR2032. This is not true. It shows, for example, 2.32V when the multimeter reads 2.95V. Other testers on the market have the exact same behavior, but they do not claim to measure volts. It is accurate for other voltages, although it may take 2-3 seconds for the reading to stabilize.
Therefore, minus 3 stars.

Very good, value for money tool. Somewhat bulkier compared to others that are powered by their own battery. Excellent accuracy at 1.5V and very good at 9V. However, note that it only measures button batteries of 1.5V (alkaline, e.g. LR44) and not 3V batteries (lithium, e.g. CR2032)

It measures batteries of 1.5V with exceptional accuracy and with minimal deviation downwards (e.g. 9.20 instead of 9.35) for 9V batteries. The comparison is always made with a regular multimeter.
Unfortunately, it cannot measure, not even approximately, 3V lithium (button) batteries. (I thought it would do so because it resembles the corresponding Varta).
Otherwise, it gives the same indications as the cheaper BT-168D models that work without a battery. However, it excels in size (clearly smaller)

Τα χρησιμοποιώ για τρίτο καλοκαίρι. Έχουν μεγάλους φακούς και εξαιρετικά λεπτό προφίλ, οπότε η ορατότητα είναι η καλύτερη που είχα ποτέ. Όμως... μπάζουν. Σε μένα αποκλειστικά στο αριστερό μάτι. Παρότι στο κατάστημα φαίνεται να βεντουζάρουν μια χαρά στο πρόσωπο, μέσα στη θάλασσα μόνο μετά από ώρα και αρκετά βάλε-βγάλε μπορεί να επιτύχεις απόλυτη στεγανοποίηση.

I have had it for a month now, I bought it for purely winter use within the city. Heavy like armor, high-quality construction, and in terms of value for money, it has no competition. Some details for those interested:
- Perfect in terms of airtightness, nothing gets through, I haven't encountered any significant rain so far.
- The external pockets have openings both from the side and with lining, very convenient for hands when you need to rest and walk.
- The internal linings do not have a single, semi-circular zipper but two side zippers and a loop at the top. The connection seems less sturdy but it has the advantage that you can pull the waterproof lining higher up on the neck, above the outer shell. However, a neck warmer is necessary in the cold. By the way, I still haven't come across a motorcycle jacket with a truly high neck (like the political ones) and I still wonder why.
- The collar around the neck is quite tight. I have a normal neck and I have to fasten it with effort (obviously at the loosest adjustment).
- The first point where you will feel "coolness" is the inside of the elbows. It doesn't leak from anywhere (checked), it's just that the line is narrow in that specific area and it sticks to the arm. I'm talking about below 5°C, nothing tragic, just a slightly unusual sensation that I hadn't experienced before.
- The patches on the sleeves are with Velcro and can be removed (some people are bothered by the Greek flag...)
- The light gray variation is as beautiful as it looks - if you involve your wife, she won't leave you any other choice.
Recommended.