Rank #3 in Best Digital Multimeter 2026: 10 Ranked, and the Number That Doesn't Measure Anything
AstroAI TRMS 4000-Count Multimeter, Auto or Manual Range
- Rating
- 4.6
- Ratings
- 8,850
- Rank
- #3
Price and rating as shown on Amazon when we collected them. Both change.
The AstroAI Digital Multimeter TRMS 4000 Counts is the third meter in this guide and the second AstroAI. At £17.99 it costs £6 more than the £11.99 AstroAI that sits at number one on 55,860 ratings, and what the extra money buys is a 4,000-count True RMS meter rather than a 2,000-count one: the bullets list AC/DC current, capacitance, frequency and temperature, none of which the cheaper meter reads. Its own 8,850 ratings average 4.6 out of 5.
The contradiction in this listing is the temperature claim. The bullets sell the meter as testing Temperature and the item name repeats it, but the only temperature figure in the specification table is an Upper Temperature Rating of 40 degrees Celsius, and the listing never says whether that is a measurement ceiling or the meter's own operating limit. The same listing calls it auto-ranging in the bullets and "Manual and Auto Ranging" in the item name without explaining how the two modes are chosen, and it counts one meter three ways: Unit Count 1.0 count, Number of Items 1, Number of Packs 1, Included Components "1".
Everything on this page is taken from the Amazon listing for this meter. We have not tested it.
How those 8,850 ratings break down
An average hides its own shape. This is the spread behind the 4.6 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £17.99 |
|---|---|
| Rating | 4.6 out of 5, from 8,850 ratings |
| Count resolution | 4,000 counts, True RMS |
| Upper Temperature Rating (as listed) | 40 degrees Celsius |
| Functions claimed in the bullets | AC/DC voltage, AC/DC current, resistance, continuity, capacitance, frequency and temperature; tests diodes |
| Ranging | Auto-ranging in the bullets; "Manual and Auto Ranging" in the item name |
| Safety | Two integrated fuses, F500mA/600V and F10A/600V, with overload protection on all ranges |
| Warranty | 3 years provided by AstroAI |
What it is up against
The rivals it was ranked against in Best Digital Multimeter 2026: 10 Ranked, and the Number That Doesn't Measure Anything.
Questions people ask
Does the AstroAI 4000 Counts measure AC current?
Yes. The bullets list AC/DC Current alongside AC/DC Voltage, and state that True RMS covers both AC current and voltage.
What temperature can it measure?
The bullets list Temperature among the tests, but the only temperature figure anywhere in the listing is an Upper Temperature Rating of 40 degrees Celsius in the specification table, and the two are not linked.
Is it auto-ranging or manual?
Both, according to the listing. The bullets say Auto-Ranging capability, while the item name describes the AstroAI as "Manual and Auto Ranging". The listing does not say how the modes are selected.
How many buyer ratings does it have?
8,850, averaging 4.6 out of 5. The £11.99 AstroAI at number one in this guide carries 55,860.
What is included in the box?
The listing does not break it down: Included Components reads "1", and Unit Count, Number of Items and Number of Packs are each listed as 1.
What safety protection does it have?
Two integrated fuses rated F500mA/600V and F10A/600V, described as explosion-proof ceramic, plus overload protection on all ranges. AstroAI provides a 3 year warranty.
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