2017 Master Electrician Ref. vs M
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
2017 Master Electrician Ref.
This digital handbook provides electricians and related professionals with essential electrical formulas, diagrams, and reference tables. It offers calculations, a dictionary of terms, and detailed information on wiring, motors, transformers, and more, all accessible on a mobile device.
- Electrical formulas and calculations
- Wiring diagrams for various systems
- Motor and transformer specifications
- Conductor and ampacity tables
- Dictionary of electrician terms
- NEMA standards and diagrams
- Math and conversion tools
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Master Electrician Reference (or MER for short) 2017 is your electronic pocket electrician reference guide. MER is for electrical designers, engineers, installers, contractors, facility managers, inspectors, exam candidates, apprentices, electricians, journeymen, architects, and technicians. MER is for people doing residential, industrial, and commercial work. Simply, if you are a Master Sparky or work with electricity in any way, this reference guide is for you! Have you ever lost pages or had damaged pages in your pocket electricians reference? The solution is here: Use MER to keep the most important information easily accessible on your iPhone, iPod Touch, or iPad. MER will even do calculations for you; something your old pocket reference book can't do. MER is divided into the following sections: * Simple Circuits - Ohm's law, series and parallel circuits, capacitance, inductance, impedance, and reactance. * Distributed Systems - Distribution wiring diagrams for 120, 208, 277, and 480 volts, color codes, breaker sizes, light switches and bells diagrams. * Electrical Formulas - Formulas for kVA, kW, and HP. * Color Codes - Color codes for capacitors and resistors. * Motors and Wiring - Standard motor and motor starter sizes, tables of full-load currents, locked-rotor information, overload units, OCPD, nameplate information, synchronous motor speeds, three-phase STAR and DELTA diagrams, three-wire start-stop diagram, motor frame dimensions, and motor enclosure types. * Transformers - KVA ratings for single- and three-phase current, transformer formulas. * Conductor Properties - Conductor tables, AWG and metric wire sizes, twist-on pressure connectors, and wire combinations. * Ampacities - Ampacities in raceway, cable, earth, and free air, and derating tables. * Conduit Fill table * Grounding Sizes - Equipment grounding conductor (EGC) and grounding electrode conductor (GEC). * Metal Boxes - Images and sizes of metal boxes, junction / device boxes, junction / pull boxes. * Voltage Drop calculations * Dictionary of electrician terms * Insulation Charts - Table of cable and wire types * Electrical Symbols * NEMA - Plugs and wiring diagrams, enclosure types, standard underground boxes, standard fuse and breaker sizes, standard pull box / junction sizes, standard gutter and wire-ways, standard switchboards, standard busway, standard busbar ampacity, standard panelboard sizes, and standard disconnect sizes. * Math and Conversions - Formulas for algebra, geometry, fractions, temperature conversion, trig tables, unit conversions, metric prefixes, and conversions between inches and millimeters. * Conduit Bending - Includes the guide "The Master Bender Way" on how to bend conduit. See the Master Bender app or MasterBender.com website for more information. * Conduit Weights * Copper Wire Cost * Hole Saw Sizes * Material Raceway Support * Lighting - Fluorescent, high-intensity discharge, incandescent, LED, and low-pressure sodium. * Standard Tool List * Torque - Lugs, bolts, and screws, tightening torque. * Dry, Damp, and Wet Locations * Hazardous Locations * Wiring Methods * Safety - Lock-out / tag-out (LOTO), and a safety manual and first aid. Most pages contain a general scientific calculator. It is expression based: Just enter an expression and evaluate it. It understands trig and power functions, can convert between radians and degrees, and has built-in basic constants like pi and e. MER includes key NEC tables from the National Electrical Code (NEC) 2017. We also have MER apps available for NEC 2011 and NEC 2014 code years. Visit our website at MasterSparky.com for more information.
M
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DAY 2+ M-Work App provides mobile service application for field service technicians of general contractors and subcontractor companies, they can use mobile phones, tablets to complete work efficiently and accurately. Using the mobile app, the entire field service platform is visible in the palm of the technician's hand, adding to the convenience of service. Technicians can communicate well with the work assigned to them, as well as managers and dispatchers. Technicians focus on the services they need to provide, update the progress and completion of project assignment tasks, and paperless work makes the work efficiency of on-site staff Multiplied. Key features include: - Log in with your email anytime, anywhere for full access to your assigned work - You can use the mobile terminal to check in daily work tasks - You can view the daily work schedule assigned to you - You can view the detailed data information of the work order assigned to you, and update the work order task progress synchronously - You can view task-related drawings, attachments and photo information to help you work better - Safety checks to help you identify potential threats on the job site - When the platform assigns you new work tasks, you will receive notifications - Instant messaging for quick and easy communication with managers and dispatchers, whether on site or in the office - manage your profile
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Verdict
The clearest difference is price: M at Free against 2017 Master Electrician Ref.'s $9.99. M also leads on update cadence (monthly vs every 5 months). 2017 Master Electrician Ref.'s advantage is chart position (#136 vs unranked) and iOS requirement (12.0 vs 15). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
M is free to download; 2017 Master Electrician Ref. costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
2017 Master Electrician Ref. ships an update every 5 months, M monthly. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.
| Parameter | 2017 Master Electrician Ref. | M |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.7 (1.3K ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 1.3K — better | — |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #136 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 15 |
| Further details — not scored | ||
| Size | 46 MB | 58 MB |
| Age rating | 12+ | 4+ |
| Developer | PawEng, LLC | Theron Technology Solutions LLC |
Bugs and requests
2017 Master Electrician Ref.
Reported bugs
3 issues- Conduit fill information missing for certain types
- Login screen freezes
- Compatibility issues with older devices
Requested features
3 requests- Update to latest NEC code
- Add calculation tools for conduit fill and voltage drop
- Improve user interface and navigation
M
Not enough reviews yet to summarise bugs or requests.
In-app purchases
2017 Master Electrician Ref.
No in-app purchases
M
No in-app purchases
Questions
Is 2017 Master Electrician Ref. free?
Is M free?
Do 2017 Master Electrician Ref. or M have ads?
Which is updated more often, 2017 Master Electrician Ref. or M?
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