Home Page Online Supply - Books, Videos and Tools for the Electrical and Construction Trades
 VisaMastercardAmerican ExpressDiscoverPayPal

  Print Order Form 

Vacuum Gauges:

Air Conditioning & Refrigeration Systems (HVACR) Evacuation

ROBINAIR 14010A Thermistor Vacuum Gauge

ROBINAIR 14777 Compact Electronic Thermistor Vacuum Gauge
Robinair Logo

>> The Importance of Measuring Vacuum  

Orders over $300 ship FREE to 48 States

ROBINAIR 14777 Compact Electronic Thermistor Vacuum Gauge

ROBINAIR 14777 Compact Thermistor Vacuum Gauge -

Robinair’s 14777 electronic vacuum gauge is just 2-1/2" x 3" in size, but accurate enough to clearly indicate when the system is free from moisture and ready for recharging.

  • Specifically designed for use with a high vacuum pump, the 14777 measures to 10 microns.
  • Clearly Shows Vacuum Level – The display is an easy-to-read LCD type with readout showing the current vacuum level.
  • 6' Lead for Service Flexibility – Hang the gauge in a location that’s convenient for you to monitor vacuum level.
  • Mounting Magnet – Position the 14777 where it’s easy to read the LCD. - more

The Importance of Measuring Vacuum:

Vacuum PumpsMoisture in an A/C system is a serious problem for the technician – it causes freeze-ups and corrosion, seriously damaging the A/C system. The most effective way to eliminate moisture is to create a vacuum deep enough to boil it away. For that, you need a high Vacuum Pump, and a tool to tell you when the vacuum is deep enough to adequately dehydrate the system.

Without a means of measurement, evacuation time is based on guesswork. The length of time required for thorough dehydration will vary from system to system because of several factors – so using a clock isn’t foolproof. You risk not removing all the moisture – or wasting time by running the pump long after evacuation is complete. Manifold Gauge Sets

Many service technicians rely on the compound gauge of the Manifold to read vacuum. While the manifold is good for gross measurements, it’s simply not accurate enough to determine exact vacuum levels. It’s designed to read low pressures in inches of mercury, but there’s no way to read exact levels when you’re pulling the last, most critical inch of vacuum.

If you look at the compound gauge face, you can see that it’s not possible to clearly differentiate between 29" Hg and 29.9" Hg, for example. But in microns – the precise measurements for the last inch of vacuum – that’s the difference between roughly 23,000 and 250 microns.

A closed-end, U-tube, mercury manometer is capable of reading to 500 microns. However, it’s a delicate instrument, more suited to a laboratory or controlled environment.

The most economical, effective, and easy-to-use option is an Electronic Thermistor Vacuum Gauge. It eliminates the guesswork by measuring the vacuum to precise micron levels, ensuring the system is leak-free, moisture-free, and ready to be recharged. Although originally developed as a laboratory instrument, today’s thermistor vacuum gauges are rugged enough – and reliable enough – for field service work.


HVAC Tools
Refrigerant Charging Scales
Refrigerant Recovery Machines
Manifold Gauge Sets
Vacuum Pumps
Leak Detectors
Gas Detectors

more HVAC/R Related
HVAC Exam Prep
Plumbing Related
Electrical Menu


Order Online
Order online: Secure ServerAdd the item(s) to your shopping cart and submit your order online through an encrypted secure server. Major Credit Cards and PayPal are accepted.

Mail your Order Order offline: Print an offline order form and Mail or Fax your order to us.

Subscribe to Our Newsletter
 Subscribe to Our Newsletter for New Product info, Announcements & Specials

Contact us

VisaMastercardAmerican ExpressDiscoverPayPal
Policy/Contact info

Arc Flash Clothing (PPE)    Automotive    Blue Print Reading    Building Codes    Business/Office    Calculators/Measuring    DataComm-VDV Concrete    Construction    Cost Guides    Electrical 1   2     Electrical Exam Prep    Electrical-Supplies   Electrician-Tools    Electronics Emergency / Rescue    Estimating     Fire / Firefighting    Gifts    Green Bldg    HazMat    Hobby    HVAC-R    HVAC Exam Prep    HVAC-Tools   Inspection   Insulated-Tools   Legal   Low-Voltage   Maintenance   Motor Control / PLC    New / Specials    Plumbing   PPE    Rack-A-Tiers   Safety    Small-Engines    SmartBox    Software    Spanish    Test-Equipment    Tools    Utility    Voice-Data-Video    Welding    Work-Gear

Home ] Contents ] Feedback ] Search ] [ News ]

VisaMastercardAmerican ExpressDiscovereCheckPayPal

Order Form
Policy/Contact info