Tyre Pressure Gauge: Pencil, Dial or Digital, and Is It Accurate?

Your pencil gauge says 30 psi, the dial gauge on the bench says 33, and neither will reach the inner valve on the van’s twin rear wheels. You need a gauge with a stated accuracy and the right range, checked against a reference, with a twin head for duals.

PartsForMachines lists 67 tyre pressure gauges, tread-depth gauges and related tyre tools from PCL, Sealey and Draper.

Pencil, Dial or Digital: Which Tyre Gauge Reads Most Consistently?

Any of the three can do the job; the stated accuracy, the scale and how you treat the gauge matter more than the type. A pencil gauge such as the TPG1H17 angled-head pencil gauge needs no batteries, holds its reading off the valve and is rated at ±2 psi.

Dial gauges are quick to read. The DPG3H03 has an impact-absorbing rubber casing, and its accuracy is certified to the European tyre gauge standard, BS EN 12645.

A percentage of full scale is the same plus-or-minus amount at every point on the dial, so it matters more at low pressures. The DPG1H03, rated ±1.6% of full-scale deflection on a 170 psi dial, can be about 2.7 psi out at 30 psi as well as at 150.

How Can I Check My Tyre Gauge Is Still Reading Correctly?

Compare it with a gauge you know is right, at the pressure you normally set, and note the difference. Check both on the same tyre, one straight after the other. Write the offset on a label on the gauge.

A master gauge kept only for this job is the simplest reference. The TE60H01 master pressure gauge covers 10–160 psi with a stated accuracy of ±1 psi. It is made for checking gauges and inflators, not daily use. If your gauge falls outside its own tolerance, replace it or keep using the offset.

Twin Rear Wheels: Which Gauge Head Reaches the Inner Valve?

Use a twin-head gauge, ideally on a long-reach arm, to reach the inner valve past the outer wheel. The TSTPG34 long-reach twin connector gauge has a 120mm arm for inner twin tyres and reads up to 220 psi at ±2 psi. The TST/PG3 and TST/PG4 twin push-on gauges are also designed for twin tyres, reading 0–160 psi.

For awkward angles, the Draper 69924 has a 250mm flexible hose with a swivel angled connection. Unsure which head suits? Send our team a photo of the valves.

Car, Van or Lorry: What Range and Units Should My Gauge Read?

Choose a gauge whose scale runs comfortably past the highest pressure in your vehicle handbook. Car pencil gauges such as the TPG1H17 stop at 50 psi. The TPG4H17 pocket service gauge reads 10–120 psi for commercial vehicles, and the TPG60H03 runs to 160 psi.

If your handbook gives bar, 1 bar is 100 kPa, or about 14.5 psi, so 7 bar is roughly 102 psi. Dual-scale dials such as the DPG3H03 show psi and bar on one face, and digital gauges such as the DTPG8 switch between units.

What Should I Check Before I Buy a Tyre Pressure Gauge?

the highest pressure you set sits well inside the gauge’s scale
a stated accuracy, such as ±2 psi or a percentage of full scale, or BS EN 12645 certification
the head type for your valves: straight, angled, twin or long-reach for twin wheels
the units you work in: a psi and bar dual scale, or a digital that also shows kPa
for a digital gauge, the battery type and operating temperature; for any gauge, a tin or case

Browse the tyre pressure gauge range, or contact the PartsForMachines team by WhatsApp, telephone or email with your vehicle type and the pressures you set, and we will help you choose.

Product options, delivery options and returns terms are shown on each product page. A 30-day return policy applies to eligible items.

Frequently Asked Questions

Does a tyre gauge need recalibrating, or should I just replace it?

Replace a cheap pencil gauge once it reads outside its tolerance against a reference. A master gauge such as the TE60H01 can go back to PCL for recalibration.

Why do my pressures change between a cold morning and a warm afternoon?

Tyre pressure follows air temperature. Tyres lose about 1 psi for every 10°F (about 5.5°C) drop, so the same tyre can read lower on a cold morning than on a warm afternoon. Compare readings taken at similar temperatures.

What does the friction device on a pencil gauge do?

It holds the reading after you take the gauge off the valve, so you can read it at a comfortable angle. The TPG1H17 and TPG4H17 both have one, plus a positive sealing washer for a reliable connection.

What is the deflator button on a tyre gauge for?

It lets a little air out so you can fine-tune the pressure without another tool. Pencil gauges such as the TSTPG1 and TSTPG8 have a valve deflator, and the TST003 digital gauge has a pressure release valve.

Which batteries do digital tyre gauges use?

It varies, so check before you buy spares. The TSTPG10 takes one CR2032 and three LR44 cells and works from -5°C to 50°C, while Sealey’s digital gauge with a twin push-on connector uses two AAA batteries. Auto power-off helps them last.

Can I read a tyre gauge in poor light?

Yes, if you choose a digital gauge with a backlit screen or light. The DTPG8 has a large backlit screen for low-light conditions, and the TSTPG10 has an illuminated nozzle so you can take readings in poor light.

Can one gauge check both pressure and tread depth?

Yes. Combined gauges such as the TSTPG11 read pressure and tread depth up to 20mm, and the DTPG7 3-in-1 digital gauge adds a light and flashes a warning when tread is below 1.6mm.

Which gauge suits a valve tucked inside a tight wheel arch?

Choose the head angle for the space. A side-entry pencil gauge such as the Draper 51541 is made for confined wheel arches, while an in-line head such as the 51536 connects straight onto a valve where space is restricted.

How should I store a tyre gauge?

Keep it in its tin or case, away from knocks. The TPG1H17 and TPG4H17 come in a storage tin, and the DPG3H03 has a rubber casing against minor damage. Check it against a reference gauge now and then.