Buy the Fluke 117 digital multimeter with non-contact voltage detection (B000O3LUEI) if you do mains-adjacent electrical work at 600 V and below and want built-in go/no-go voltage checks plus automatic AC/DC selection; buy the Klein Tools MM720 TRMS multimeter with temperature and 1000 V range (B0B57PDQJC) if you want a wider 1000 V / CAT IV-rated envelope plus temperature measurement for about $153 less, and can live without built-in non-contact detection. The Fluke concentrates on electrician speed and safety checks: the maker describes a compact CAT III 600 V True-RMS meter with VoltAlert non-contact detection, AutoVolt automatic AC/DC selection, a low-impedance mode against misleading ghost-voltage readings, and a 6,000-count display with a 33-segment bar graph. The Klein concentrates on range and value: the maker describes TRMS auto-ranging to 1000 V AC/DC and 10 A AC/DC, 60 MΩ resistance, capacitance, frequency, duty-cycle, diode and continuity testing, a K-type temperature function, LoZ mode, a reverse-contrast 6,000-count display, a 6.6-foot drop rating with IP42, and CAT IV 600 V / CAT III 1000 V safety ratings. On 09/16/2026 the exact Fluke 117 was In Stock on Amazon US at $252.99, shipped from and sold by Amazon.com with delivery as soon as Sunday, Sep 20, and the exact Klein MM720 was In Stock at $99.97, shipped from and sold by Amazon.com with delivery as soon as Saturday, Sep 19.
Shopping note: the links in this guide are paid links to the exact listings observed for this comparison. As an Amazon Associate, Cadiens earns from qualifying purchases. Prices, stock and sellers move; confirm the model code and the live offer before buying.
Choose by your situation
| Situation | Model to consider | Main tradeoff |
|---|---|---|
| You check residential or light-commercial circuits and want a fast live/dead sanity check before touching a conductor | Fluke 117 | 600 V maximum terminal-to-ground and CAT III 600 V only; about $153 more than the Klein on 09/16/2026; no temperature function named in the observed pages |
| You want the widest paper envelope: 1000 V measurement, CAT III 1000 V / CAT IV 600 V ratings, plus temperature | Klein MM720 | No non-contact voltage function named in the observed pages; smaller review base (393 ratings vs 5,216); resistance and capacitance ceilings differ, see table |
| You misread ghost voltages on long or shared-neutral runs and want the meter to sort AC/DC out by itself | Fluke 117 | AutoVolt picks AC/DC for you, but you still dial other functions manually; 40 MΩ resistance ceiling per the users manual |
| You diagnose HVAC, appliances or automotive charging and need temperature alongside volts, amps and capacitance | Klein MM720 | Temperature needs the included K-type probe and adapter in the jacks; thermocouple accuracy is probe-limited, not meter magic |
| You work in dark panels or bright sunlight and read the display all day | Klein MM720 | Reverse-contrast auto display is a readability claim, not a measured test; the Fluke answers with a backlight plus an analog-style bar graph |
Specifications that change the decision
| Criterion | Fluke 117 (B000O3LUEI) | Klein MM720 (B0B57PDQJC) |
|---|---|---|
| Safety rating, per maker and manual | CAT III 600 V (users manual lists 115/117 at CAT III 600 V); maximum 600 V between any terminal and earth ground | CAT IV 600 V and CAT III 1000 V (maker page and instruction manual); double insulation, Class 2 |
| Voltage range | AC 0.06–600 V and DC 0.001–600 V per the users manual features table | Up to 1000 V AC/DC per maker; 1000 V AC RMS or 1000 V DC maximum input per manual |
| Current | 10 A named in the manual specification line for 115/117; fused A input (11 A, 1000 V FAST fuse per maker specs) | 10 A AC/DC per maker spec block |
| Resistance | 0.1 Ω to 40 MΩ per users manual | To 60 MΩ per maker and manual |
| Capacitance | 1 nF to 9999 µF per users manual | 6000 µF per maker spec block |
| Frequency | Named with 5 Hz–100 kHz on the AC-voltage function per manual | 1 Hz–500 kHz per maker spec block, plus duty-cycle |
| Temperature | No temperature function named in the observed maker, manual or listing pages | K-type thermocouple with adapter included; −40° to 1832 °F (−40° to 1000 °C) per maker |
| Non-contact voltage | VoltAlert built-in go/no-go detection per maker and manual display symbol | No non-contact voltage function named in the observed maker, manual or listing pages |
| AC/DC handling | AutoVolt/Auto-V LoZ: automatically selects AC or DC with a low-impedance input | Auto-ranging TRMS within the dial-selected function, plus a separate LoZ mode for stray voltages |
| Display | Digital 6,000 counts updating 4 per second, 33-segment bar graph, backlight per maker specs | 6000-count LCD with reverse contrast that auto-optimizes for dark or bright light per maker |
| Ruggedness | Holster included in the box; no drop or ingress rating in the observed pages | 6.6 ft (2 m) drop protection and IP42 per maker and manual |
| In the box | Meter, test lead set, holster and quick reference guide per maker | Meter, pouch, test leads with CAT III/IV safety caps, thermocouple with adapter, 2 × AAA per maker |
| Observed Amazon US offer, 09/16/2026 | $252.99, In Stock, shipped from and sold by Amazon.com; 4.8 stars across 5,216 ratings (listing display) | $99.97, In Stock, shipped from and sold by Amazon.com; 4.6 stars across 393 ratings (listing display) |
Fluke 117: the electrician-speed pick under 600 V
The Fluke 117 (US variant, part number FLUKE 117) is the meter to pick when the job is everyday electrical work at 600 V and below and every saved step matters. The mechanism is explicit in the observed maker and manual pages: VoltAlert gives a fast non-contact go/no-go check so you do not fetch a separate tester, AutoVolt selects AC or DC automatically through a low-impedance input, and the low-impedance mode guards against ghost-voltage misreads on dead-but-coupled conductors. The manual pins the envelope down: CAT III 600 V for the 117, 0.1 Ω–40 MΩ resistance, 1 nF–9999 µF capacitance, continuity beeper on below 20 Ω and off above 250 Ω, and Min/Max/Average recording. The weaknesses are just as explicit: 600 V is the ceiling terminal-to-ground, there is no temperature function in any observed page, and at $252.99 observed it costs about two and a half times the Klein. The listing display (4.8 stars, 5,216 ratings, Amazon's Choice) signals a large installed base, not a lab result.
Klein MM720: the wide-envelope value pick
The Klein Tools MM720 (model and part number MM720) is the meter to pick when range per dollar decides: 1000 V AC/DC with CAT III 1000 V / CAT IV 600 V ratings on paper, 60 MΩ resistance, temperature via the included K-type probe, and a 6.6-foot drop rating with IP42, all for $99.97 observed. The manual corroborates the headline claims instead of just repeating the box: 1000 V maximum input, LoZ low-impedance function, continuity, diode, capacitance, frequency and duty-cycle procedures, and a temperature procedure that puts the thermocouple plus adapter into the VΩ and COM jacks. The tradeoffs: no non-contact voltage function appears in the observed maker, manual or listing pages, so live/dead prescreening still needs a separate tester; the review base is an order of magnitude smaller (4.6 stars, 393 ratings); and the capacitance ceiling (6000 µF) sits below the Fluke's 9999 µF, which matters on large motor-run capacitors.
Batteries, leads and upkeep
Both meters run on replaceable batteries and ship with leads, so there is no charging dock to compare. The Fluke box carries a holster plus silicone test leads and documents an 11 A, 1000 V FAST fuse on the amps input; price that exact fuse before you assume a blown input is a cheap fix. The Klein box carries a pouch, leads with CAT III/IV safety caps, the thermocouple and 2 × AAA batteries, and the manual points to an easily accessible battery and fuse compartment with a low-battery indicator. Treat test leads as consumables on either meter: cracked probes or damaged CAT safety caps void the safety story faster than any specification difference. Neither observed page prices replacement leads, fuses or pouches, so this comparison does not score running costs.
Limits of this comparison
No independent accuracy, drop or ingress testing was performed; safety ratings and tolerances are maker and manual claims, and star ratings are listing displays, not measurements. Stated accuracy rows (for example the Klein manual's ±(1.0% + 3 digits) on the 1000 V range) only matter against your own tolerance, so compare the full accuracy tables in the linked manuals before buying for calibration-sensitive work. Prices, stock, sellers and delivery dates move; every commercial fact here is dated 09/16/2026 and must be re-observed before any purchase decision is treated as current.
Sources and further reading
- Amazon.com — Fluke 117 Digital Multimeter with Non-Contact Voltage (B000O3LUEI)
- Amazon.com — Klein Tools MM720 TRMS Multimeter 1000V (B0B57PDQJC)
- Fluke US — 117 Electrician's Multimeter with Non-Contact Voltage
- Klein Tools — Digital Multimeter TRMS Auto-Ranging 1000V Temp LoZ (MM720)
- Fluke — 110/113/114/115/117 Users Manual (covers 117)
- Klein Tools — MM720 Instruction Manual