Teclock model model AI-921 (also known as PDI-2)
Teclock has been the manufacturer of a wide variety of precision gages for over 50 years. The accuracy of these made-in-Japan dial indicators is comparable to European-made gages even if the workmanship and durability are lacking. The economical prices of these gages make them ideal for short runs or as throw-aways. If damaged, you may have no other option but to replace them. Teclock models are usually not repairable.
All inch models (AI) use imperial 4-48 thread contact points and have 3/8" diameter stems.
Metric models (KM,TM) use metric M2.5 thread contact points and have 8mm diameter stems.
AGD Group 2
Indicators in this group have a dial diameter approx. 2.2" Includes lug mount back. A bezel clamp and two tolerance markers are provided which you must install yourself. Model AI-921B features a black dial while model AI-921, by far the most popular, has a white dial and shock-proof movement. Model AI-922 is the same as AI-921 but it has a balanced 0-50-0 dial. Model AI-921N contains unreliable plastic parts and is discontinued. You'll want to replace it with AI-921 which has all metal components.
Teclock indicators are often disguised with vanity dials such as SPI. Some of the models offered below will have the SPI logo on the dial. Other than the name, the indicators are identical.
Note: replacement indicators for Teclock dial bore gages are not available at this time. Other manufacturers' indicators will not fit the Teclock bore gages. We strongly urge you to think twice before investing in Teclock dial bore gages.
Teclock AI-951 with 2" range does not have tolerance markers
If your model is not listed, or no longer available check for replacement models. You will find a selection of contact points on page 133. Each model is available with white or black dials.
Great idea: add a spindle lifting lever to any of these dial indicators! See page 237.