The Insize Digital Inside Groove Caliper 1120-150A has a measurement range of 22-150mm, making it suitable for a variety of precision measurements. This digital caliper offers a resolution of 0.01mm/0.0005", allowing for highly accurate readings. With its compact size and easy-to-use design, this caliper is ideal for professionals in various industries who require precise measurements of inside grooves with a minimum measurement of 0.87 inches (22mm) and a maximum measurement of 6 inches (150mm).