Frequently Asked Questions

Which is better for home use — the AstroAI 2000 Counts or the TESMEN TM-510?

For most home users, I’d pick the TESMEN TM-510. It has 4000 counts compared to the AstroAI’s 2000, which gives you better resolution when measuring voltage. The auto-ranging feature also means you don’t have to fiddle with the dial to find the right range — just touch the probes and it figures it out. Plus, the non-contact voltage detection lets you safely check if a wire is live without touching it, which is a huge safety win for homeowners.

Is the TESMEN TM-510 worth the extra money over the AstroAI?

Given that both are competitively priced and often within the same range, I’d say yes — the TESMEN gives you double the counts (4000 vs 2000), auto-ranging, and a non-contact voltage function that the AstroAI lacks. The only reason to go with the AstroAI is if you specifically need to measure DC current (amps), which the TESMEN can’t do. For everything else, the TESMEN is the better value.

Which multimeter is easier for beginners — AstroAI or TESMEN?

The TESMEN TM-510 is easier for beginners because of its Smart Auto Mode. You don’t need to know what range to set — the meter automatically selects AC/DC voltage, resistance, or continuity based on what it detects. The AstroAI requires you to manually turn the dial to the correct setting and range, which can be intimidating if you’re new to multimeters. I’d recommend the TESMEN for anyone who just wants to start testing without reading a manual first.

Can the AstroAI measure DC current, and can the TESMEN?

Yes, the AstroAI can measure DC current (amps) — it’s listed as measuring DC Current, Resistance, and Diode. The TESMEN TM-510, on the other hand, does not measure DC current at all. If you need to check the current draw of a car battery or a fuse, the AstroAI is the only option here. For voltage, resistance, and continuity checks, both meters work fine.

Which multimeter has better safety features?

The TESMEN TM-510 has a slight edge in safety. It’s CAT II 600V rated with CE and RoHS certification, and it includes non-contact voltage detection so you can test for live wires without touching them. The AstroAI has double fuse anti-burn protection and a silicone cover to prevent shocks, but it lacks NCV. Both meters are safe for home use, but the TESMEN gives you an extra layer of protection.

Which multimeter is lighter and more portable?

The TESMEN TM-510 is much lighter at 100g (0.1 kg) compared to the AstroAI at 253g. It also comes with a storage bag, making it easy to toss in a toolbox or backpack. The AstroAI is heavier and doesn’t include a bag. If portability matters to you, the TESMEN is the clear winner.