AUTOOL PT503 Mini Differential Pressure Gauge

AUTOOL PT503Product OverviewThe AUTOOL PT503 is a compact mini differential pressure gauge for positive pressure, negative pressure, and differential pressure measurement. It is designed for portable on-site testing, automotive intake, brake booster, exhaust, crankcase or crankshaft-related pressure checks, and quick mobile diagnostic work. With a high-precision pressure sensor, 6 switchable pressure units, data hold, a backlit LCD display, and a reinforced portable body, PT503 helps users capture and record pressure changes clearly in workshop or field environments. Positive / Negative / Differential ±0.5%FS Accuracy 6 Pressure Units Data Hold-101~200kPaTesting Range0.1kPakPa Resolution2×AAABattery Power3 YearsWarranty Click to enlargeKey FeaturesKey FeaturesPT503 combines accurate pressure sensing, a readable backlit display, one-button data hold, 6-unit switching, portable body design, and adapter support in a compact diagnostic gauge.High-Precision SensorMeasures from -101kPa to 200kPa with accuracy up to ±0.5%FS, helping users capture subtle pressure changes during diagnostic and maintenance work.Three Pressure TypesSupports positive pressure, negative pressure, and differential pressure measurement for compact automotive and general pressure testing workflows.1.8-Inch Backlit LCDThe LCD backlit display helps users read pressure values clearly in bright, dim, workshop, or field testing environments.One-Button Data HoldLock the current reading for easier recording, comparison, or reporting when the pressure value needs to remain visible after measurement.6 Switchable UnitsSwitch between psi, inHg, kPa, mbar, bar, and mmHg without manual conversion, making the pressure result easier to match to different service references.Portable Body & AdaptersThe 125 × 56 × 30mm body weighs about 120g and works with the included measurement adapters shown in the package image for different pressure ports. Click to enlarge Click to enlarge Click to enlarge Click to enlarge Click to enlarge Click to enlargeSpecificationsPT503 Product SpecificationsReview the key measurement, power, display, environment, and body specifications before choosing PT503 for compact pressure testing.MeasurementProductAUTOOL PT503 Mini Differential Pressure GaugePressure TypesPositive pressure, negative pressure, and differential pressureTesting Range-101kPa ~ 200kPaAccuracy±0.5%FSResolution0.01psi / 0.01inHg / 0.1kPa / 1mbar / 0.001bar / 1mmHgPressure Unitspsi, inHg, kPa, mbar, bar, mmHgPower And EnvironmentPower Supply2 × 1.5V AAA batteriesOperating Temperature-10°C ~ 60°CStorage Temperature-20°C ~ 70°CAuto Power-OffAutomatically powers off after about 5 minutes of no operation or no pressureBody And DisplayDisplay1.8-inch LCD backlit displayProduct Size125 × 56 × 30mmProduct WeightAbout 120gAdapter ReferenceMultiple measurement adapters are included as shown in the package and adapter imagesWarranty3-year warranty for eligible non-human damage cases and lifetime maintenance support Click to enlarge MeasurementPressure TypesPositive / Negative / DifferentialTesting Range-101kPa ~ 200kPaAccuracy±0.5%FSResolution0.01psi / 0.01inHg / 0.1kPa / 1mbar / 0.001bar / 1mmHgUnitspsi / inHg / kPa / mbar / bar / mmHg Power And BodyPower Supply2 × 1.5V AAA batteriesDisplay1.8-inch LCD backlit displayProduct Size125 × 56 × 30mmProduct WeightAbout 120gAuto Power-OffAbout 5 minutes of no operation or no pressure ApplicationsApplicationsUse PT503 for compact automotive pressure, negative-pressure, and differential-pressure checks when the measurement range and connector setup match the test point.Intake Manifold TestingUse PT503 to support intake system pressure or negative-pressure checks during engine diagnostic work.Brake Booster TestingAssist brake booster pressure or vacuum-related checks with the correct connector and safe measurement setup.Crankcase Pressure ChecksUse the gauge for crankcase or crankshaft-related pressure variation checks during vehicle maintenance and troubleshooting.Exhaust And General ChecksSupport exhaust and general low-pressure diagnostic checks within the PT503 measurement range and suitable media conditions. Click to enlargeHow To UseHow To UseInstall batteries, let the gauge zero in open air, connect the correct hose and adapter, select the display unit, and lock the reading when you need to record the result.Install Batteries And Power OnInstall 2 × 1.5V AAA batteries. Power on the gauge without pressure applied so the startup auto-zero and atmospheric pressure calibration remain accurate.Connect Hose And AdapterChoose the correct hose and adapter for the test port. Check the hose, adapter, and connector condition before starting measurement.Select Unit And BacklightUse the unit function to switch between psi, inHg, kPa, mbar, bar, and mmHg. Use the backlight function when the working area is dim.Hold And Record DataUse the data hold function to lock the reading before recording, comparing, or reporting the pressure value.Use NotesDo not power on the PT503 while pressure is already applied.Do not exceed the 200kPa maximum measurement range.Avoid squeezing or sharply bending the silicone tube during testing.Replace the batteries if the battery indicator flashes or the reading becomes unstable.The gauge can automatically power off after about 5 minutes of no operation or no pressure. Click to enlarge Click to enlargeProduct ComparisonProduct ComparisonPT503 is the mini portable option for quick on-site pressure testing. Compare it with PT520 and PT530 if you need a larger screen, data storage, higher accuracy, or a wider measurement range.Choose PT503 IfYou need a mini portable gauge with a 1.8-inch display, -101~200kPa range, ±0.5%FS accuracy, and simple field use.Choose PT520 IfYou prefer a larger 2.8-inch display, 29 groups of data storage, and higher ±0.3%FS accuracy for a more complete digital manometer setup.Choose PT530 IfYou need a higher-level dual-port differential pressure gauge with -100~300kPa range, ±0.25%FS accuracy, storage support, magnetic back, button light, and tool box configuration.Shared ApplicationsAll three models can support intake manifold, brake booster, crankcase, and suitable pressure testing scenarios when the test setup is correct.Decision CheckCompare portability, display size, data storage, accuracy, range, adapters, application scope, and budget before ordering. Click to enlarge Click to enlargeWhat Is In The BoxWhat Is In The BoxThe packing image shows the PT503 main unit and included accessories. Use the package image as the final visual reference before ordering.Main UnitAUTOOL PT503 mini differential pressure gaugeDocumentationAUTOOL PT503 user manualPackageRetail box shown in the package imageAdaptersMeasurement adapters shown in the package imageHose / TubingMeasurement hose and tubing shown in the package imageSupport3-year warranty and lifetime maintenance supportManual And DownloadsManual And DownloadsDownload the AUTOOL PT503 EN-DE manual for setup, unit switching, data hold, display reference, measurement preparation, and operation guidance. Click to enlargeAUTOOL PT503 User ManualOpen the PDF manual for pressure unit switching, data lock, measurement setup, display icons, battery use, and safe operation. Download ManualNeed PT503 Setup Help?Contact AUTOOL Store for adapter confirmation, unit switching, data hold, battery setup, differential pressure testing, manual support, or model selection help. Email[email protected] WhatsApp 86 189 2647 7404Before You Order And UseBefore You Order And UseConfirm the PT503 measurement range, battery requirement, connector setup, startup condition, and use limits before measurement.Do Not Exceed 200kPaPT503 measures up to 200kPa. Do not use it beyond the maximum measurement range.Power On Without PressureThe gauge performs startup zeroing and atmospheric pressure calibration. Powering on under pressure may cause inaccurate readings.Use 2×AAA BatteriesPT503 is powered by 2 × 1.5V AAA batteries. Replace batteries if the battery indicator flashes or readings become unstable.Check Hose And AdapterBefore testing, check the hose, adapter, battery condition, and connector fit to avoid unstable or incorrect measurements.Avoid Tube CompressionDo not squeeze, sharply bend, or block the silicone tube during measurement, because this may affect the pressure reading.Use Suitable MediaUse PT503 only with suitable non-corrosive test media and the correct connector setup for the pressure port being measured.Additional Use RemindersKeep the gauge away from strong vibration, strong magnetic fields, and rapid temperature changes during measurement.Use the correct pressure unit before recording values.Use data hold before writing down or comparing readings.For a larger display, data storage, or higher accuracy, compare PT503 with PT520 and PT530 before ordering.Related ProductsRelated ProductsCompare related AUTOOL digital manometers and pressure gauge tools before choosing the right tester for differential pressure, oil pressure, brake pressure, or workshop diagnostics. SALESelect options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Engine Pressure TesterAUTOOL PT530 Digital Manometer Dual Port Pressure GaugeRated 0 out of 5(0) From US$136.00 Select options This product has multiple variants. The options may be chosen on the product page Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Engine Pressure TesterAUTOOL PT520 Differential Pressure Gauge Digital ManometerRated 0 out of 5(0) From US$70.00 Select options This product has multiple variants. The options may be chosen on the product page Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Engine Pressure TesterAUTOOL PT620 Engine Oil Pressure Gauge with Digital DisplayRated 0 out of 5(0) From US$179.00 Select options This product has multiple variants. The options may be chosen on the product page Select options This product has multiple variants. The options may be chosen on the product page Add to wishlist Add to compare Quick view iconQuick view Engine Pressure TesterAUTOOL PT660 Brake Pressure Gauge Pressure GaugeRated 0 out of 5(0) From US$359.00 Select options This product has multiple variants. The options may be chosen on the product page Questions And AnswersThese answers cover pressure types, measurement range, units, batteries, data hold, operation, startup zeroing, preparation checks, and PT503 / PT520 / PT530 model selection. What Pressure Types Can PT503 Measure? PT503 can measure positive pressure, negative pressure, and differential pressure. It is suitable for compact automotive diagnostic pressure checks when the pressure range and connector setup match the test point. What Is The Measurement Range Of PT503? The PT503 testing range is -101kPa ~ 200kPa. Its accuracy is up to ±0.5%FS, and its kPa resolution is 0.1kPa. What Pressure Units Does PT503 Support? PT503 supports 6 pressure units: psi, inHg, kPa, mbar, bar, and mmHg. Switch to the correct unit before recording or comparing readings. What Batteries Does PT503 Use? PT503 uses 2 × 1.5V AAA batteries. Replace the batteries if the battery indicator flashes, the display becomes unstable, or the gauge cannot operate normally. Can PT503 Lock Measurement Data? Yes. PT503 supports a data hold function. Use it to lock the current reading when you need to record, compare, or report the pressure value. How Do I Switch Units Or Use The Backlight? Use the unit function to switch between psi, inHg, kPa, mbar, bar, and mmHg. Use the backlight function when the working area is dim. Refer to the PT503 manual for the exact key operation sequence. Can I Power On PT503 While Pressure Is Applied? No. Power on the gauge without pressure applied. PT503 performs startup zeroing and atmospheric pressure calibration, so powering on under pressure may cause inaccurate measurements. What Should I Check Before Measurement? Check the batteries, hose, adapter, connector fit, and pressure range before testing. Avoid squeezing the silicone tube, and do not use the gauge beyond the 200kPa maximum range. What Is The Difference Between PT503, PT520, And PT530? PT503 focuses on mini portability and quick field testing. PT520 is a larger digital manometer option with a bigger display, data storage, and higher accuracy. PT530 is the higher-level option with a wider -100~300kPa range, higher ±0.25%FS accuracy, storage support, magnetic back, button light, and tool box configuration.Warranty And ContactWarranty And ContactFor PT503 setup, adapter confirmation, battery use, unit switching, data hold, differential pressure testing, warranty, or PT503 / PT520 / PT530 model selection support, contact AUTOOL Store.Pre-Sales And Product SupportUse support if you need help confirming whether PT503 fits your intake, brake booster, exhaust, crankcase, or general pressure test needs, or if you need help choosing between PT503, PT520, and PT530.3-year warranty for eligible non-human damage casesLifetime maintenance supportManual download and setup confirmationAdapter, hose, battery, unit switching, and data hold supportPressure range and suitable media confirmationPT503 / PT520 / PT530 model selection support Email Support[email protected] WhatsApp Support 86 189 2647 7404