{"product_id":"super-stars-digital-micron-vacuum-gauge-st-vg90-accurate-hvac-leak","title":"Super Stars Digital Micron Vacuum Gauge ST-VG90 - Accurate HVAC Leak","description":"\u003cp\u003eIn this review of the Super Stars Digital Micron Vacuum Gauge ST-VG90, the bottom line is clear: this compact tool is aimed at HVAC technicians and experienced DIYers who need fast, precise evacuation readings before refrigerant charging. The review finds the ST-VG90 stands out for its professional Pirani sensor that spans from 99999 to 0.1 Pa (740000 to 0.75 micron), delivering reliable confirmation that a system is dry. It is a straightforward, pocket-sized tester with alarm features and multiple units that make routine vacuum checks quicker and less guesswork-prone.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eHigh accuracy Pirani sensor:\u003c\/strong\u003e Provides fast and precise vacuum readings across a wide range so technicians can be confident a system is moisture-free before charging.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eWide measurement range:\u003c\/strong\u003e Covers from 99999 down to 0.1 Pa (740000 to 0.75 micron), allowing verification from rough pull-down to deep vacuum levels.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eFour selectable units:\u003c\/strong\u003e Switch between Pa, mBar, mmHg and Micron to match international standards or personal preference on the jobsite.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSmart vacuum alarm:\u003c\/strong\u003e Built-in buzzer and visual alert notify when a preset vacuum level is reached, reducing over-evacuation and saving time during evacuation.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eBacklit LCD and power saving:\u003c\/strong\u003e Clear digital display with optional backlight for low-light work and automatic power-off to preserve battery life during long service days.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePump compatibility and portability:\u003c\/strong\u003e Compact, pocket-sized design with one-key calibration works with vacuum pumps of 5 CFM or higher for stable readings and easy transport in the included case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe ST-VG90 is best for HVAC technicians, refrigeration installers and advanced homeowners who perform system evacuations and want a compact, accurate gauge to confirm dryness before charging. Its selectable units and audible alarm suit field work across international jobs and varied preferences.\u003c\/p\u003e\n\u003cp\u003eLess suitable users include casual homeowners with no intent to evacuate systems themselves and those who need integrated manifold functions; this device is a dedicated vacuum gauge and not a full manifold with multiple service ports.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eVery wide and accurate measurement range thanks to the Pirani sensor, which helps ensure system integrity before charging.\u003c\/li\u003e\n \u003cli\u003eMultiple pressure units and a clear backlit LCD make readings versatile and easy to interpret in low light.\u003c\/li\u003e\n \u003cli\u003eSmart alarm and visual alert save time by signaling when the preset vacuum target is reached.\u003c\/li\u003e\n \u003cli\u003eCompact, battery-saving design and included carrying case make it practical for field service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eNot a substitute for a full manifold gauge set if you need simultaneous high- and low-side measurements or refrigerant service functions.\u003c\/li\u003e\n \u003cli\u003eAccuracy depends on using a compatible pump (5 CFM or higher) and proper connection technique for best results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eST-VG90\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eSensor type\u003c\/td\u003e\n\u003ctd\u003ePirani vacuum sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMeasurement range\u003c\/td\u003e\n\u003ctd\u003e99999 to 0.1 Pa (740000 to 0.75 micron)\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePressure units\u003c\/td\u003e\n\u003ctd\u003ePa, mBar, mmHg, Micron\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eAlarm\u003c\/td\u003e\n\u003ctd\u003eBuilt-in buzzer and visual alert\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePump compatibility\u003c\/td\u003e\n\u003ctd\u003eWorks with vacuum pumps of 5 CFM or higher\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eBacklit LCD with power-saving auto-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Super Stars ST-VG90 is a focused, reliable vacuum gauge for HVAC technicians and advanced users who need accurate deep-vacuum verification before charging. Its Pirani sensor, selectable units and alarm functionality deliver practical time savings on the job, and the compact design with a carrying case makes it a useful addition to a service toolkit for the price.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the gauge work with most vacuum pumps?\u003c\/strong\u003e\u003cbr\u003eThe gauge is designed to work with vacuum pumps of 5 CFM or higher for stable and accurate readings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I read different units on the display?\u003c\/strong\u003e\u003cbr\u003eYes, the unit switches easily between Pa, mBar, mmHg and Micron to suit different standards and preferences.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs there an alert when the target vacuum is reached?\u003c\/strong\u003e\u003cbr\u003eYes, a built-in buzzer and visual alert notify the user once the preset vacuum level is achieved to avoid over-evacuation.\u003c\/p\u003e","brand":"Super Stars","offers":[{"title":"Default Title","offer_id":48250216480987,"sku":"B0F98X6CND","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71qttsM3nPL._SL1500.jpg?v=1771067738","url":"https:\/\/gearmusthave.com\/products\/super-stars-digital-micron-vacuum-gauge-st-vg90-accurate-hvac-leak","provider":"GearMustHave","version":"1.0","type":"link"}